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Adult sexual intercourse picture

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Adult male and female reproductive anatomy and physiology during sexual intercourse. All layers named for easy editing. Download intercourse stock images. High-quality stock photos about penetration, intercourse sexual, probiotics, sex, car vector, porn, boobs. Sexual intercourse, or coitus or copulation, most commonly involves the insertion and thrusting of the penis, usually when erect, into the vagina for sexual pleasure.


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Adult sexual intercourse picture
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Adult sexual intercourse picture
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Adult male and female Small beetles having having intercourse on a stone slab; picture taken at man thinking about sexual intercourse male and. Explore dozens of fun, fully illustrated sex positions you and your partner can try. Features tasteful photos, hot tips and techniques for making love. Adult male and female reproductive anatomy and physiology during sexual intercourse. All layers named for easy editing.
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Adult sexual intercourse picture

Sexual intercourse or coitus or copulation is principally the insertion and thrusting of the penis , usually when erect , into the vagina for sexual pleasure , reproduction , or both. There are different views on what constitutes sexual intercourse or other sexual activity , [9] [10] which can impact views on sexual health.

Various jurisdictions have placed restrictive laws against certain sexual acts, such as incest , sexual activity with minors , prostitution , rape , zoophilia , sodomy , premarital and extramarital sex. Religious beliefs also play a role in personal decisions about sexual intercourse or other sexual activity, such as decisions about virginity , [10] [20] or legal and public policy matters.

Religious views on sexuality vary significantly between different religions and sects of the same religion, though there are common themes, such as prohibition of adultery. Reproductive sexual intercourse between non-human animals is more often termed copulation , and sperm may be introduced into the female's reproductive tract in non-vaginal ways among the animals, such as by cloacal copulation. For most non-human mammals , mating and copulation occur at the point of estrus the most fertile period of time in the female's reproductive cycle , which increases the chances of successful impregnation.

Sexual intercourse may be defined by different words, including coitus, copulation , coition , or intercourse which is typically shorthand for sexual intercourse.

The term coitus is derived from the Latin word coitio or coire , meaning "a coming together or joining together" or "to go together", and it describes a variety of sexual activities under ancient Latin names, but usually refers exclusively to penile—vaginal penetration. Although the terms sexual intercourse and sex most commonly denote penile—vaginal intercourse, [33] sex and the phrase "have sex" can mean any penetrative or non-penetrative sexual activity between two or more people.

Vaginal, anal and oral sex are recognized as sexual intercourse more often than other sexual behaviors. Researchers commonly define sexual intercourse as penile—vaginal intercourse while using specific terms, such as anal sex or oral sex , for other sexual behaviors.

Lerner and Laurence Steinberg state that researchers also "rarely disclose how they define sex or even whether they resolved potential discrepancies in definitions of sex". Studies regarding the definition of sexual intercourse sometimes conflict.

A study by the Kinsey Institute examined the definition of sex based on a random sample of college students from 29 U. The specificity of questions concerning sexual activity can additionally affect definitions of sexual intercourse or other sexual behaviors.

Another study by the Kinsey Institute sampled people, ranging in ages 18— Copulation ranges from a purely reproductive activity to one of emotional bonding. For example, sexual intercourse and sexual activity in general often play a strong role in human bonding.

In humans and bonobos , the female undergoes relatively concealed ovulation so that male and female partners commonly do not know whether she is fertile at any given moment. One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual partners important for social interactions and, in the case of humans, long-term partnership rather than immediate sexual reproduction.

The resulting cooperation encourages collective tasks that promote the survival of each member of the group. Sexual intercourse or other sexual activity can encompass various sexually stimulating factors physiological stimulation or psychological stimulation , including different sex positions or the use of sex toys.

In most mammals, the anatomy of the reproductive organs and some circuits of the nervous system are specifically organized for heterosexual copulation.

Copulation corresponds to a succession of innate sexual reflexes: These copulatory reflexes are controlled by hormones and facilitated by sexual pheromones. Non-primate females copulate only when in estrus , [64] but sexual intercourse is possible at any time of the menstrual cycle for women. During coitus, the partners orient their hips to allow the penis to move back and forth in the vagina to cause friction, typically without fully removing the penis.

In this way, they stimulate themselves and each other, often continuing until orgasm in either or both partners is achieved. Anal sex involves stimulation of the anus , anal cavity, sphincter valve or rectum ; it most commonly means the insertion of a man's penis into another person's rectum, but may also mean the use of sex toys or fingers to penetrate the anus, or oral sex on the anus anilingus , or pegging.

Oral sex consists of all the sexual activities that involve the use of the mouth and throat to stimulate genitalia or anus. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen or vaginal fluids.

Fingering or digital penetration or digital intercourse involves the manual manipulation of the clitoris, rest of the vulva , vagina or anus for the purpose of sexual arousal and sexual stimulation; it may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities. Sexual intercourse is perhaps million years old, and it is likely that the oldest jawed fish on Earth was the first animal to reproduce by copulation.

The subsequent route of the sperm from the vault of the vagina is through the cervix and into the uterus , and then into the fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum see sperm competition. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo.

When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins. When a sperm donor has sexual intercourse with a woman who is not his partner and for the sole purpose of impregnating the woman, this may be known as natural insemination , as opposed to artificial insemination.

Artificial insemination is a form of assisted reproductive technology , which are methods used to achieve pregnancy by artificial or partially artificial means. Reproductive methods also extend to gay and lesbian couples. For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy. Surrogacy is an arrangement in which a woman carries and delivers a child for another couple or person.

The woman may be the child's genetic mother traditional surrogacy or she may carry a pregnancy to delivery after having another woman's eggs transferred to her uterus gestational surrogacy. Gay or lesbian pairings who want the host to have no genetic connection to the child may choose gestational surrogacy and enter into a contract with an egg donor. Gay male couples might decide that they should both contribute semen for an in vitro fertilisation IVF process, which further establishes the couple's joint intention to become parents.

There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts, [19] [91] and heterosexual couples may use oral or anal sex or both as a means of birth control.

Safe sex is a relevant harm reduction philosophy, [16] [96] and condoms are used as a form of safe sex and contraception. Condoms are widely recommended for the prevention of sexually transmitted infections STIs. Decisions and options concerning birth control can be affected by cultural reasons, such as religion, gender roles or folklore.

Penile—vaginal penetration is the most common form of sexual intercourse. Regarding oral or anal intercourse, the CDC stated in , "Studies indicate that oral sex is commonly practiced by sexually active male-female and same-gender couples of various ages, including adolescents.

The prevalence of sexual intercourse has been compared cross-culturally. In the second group, the data indicated families encouraged daughters to delay marriage, and to abstain from sexual activity before that time. However, sons are encouraged to gain experience with older women or prostitutes before marriage. Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe Portugal, Greece and Romania are noted and from Latin America Brazil, Chile , and the Dominican Republic.

The study considered many Asian societies to also fall into this group, although matching data was only available from Thailand.

In the third group, age of men and women at sexual initiation was more closely matched; there were two sub-groups, however. In non-Latin, Catholic countries Poland and Lithuania are mentioned , age at sexual initiation was higher, suggesting later marriage and reciprocal valuing of male and female virginity.

The same pattern of late marriage and reciprocal valuing of virginity was reflected in Singapore and Sri Lanka. The study considered China and Vietnam to also fall into this group, though data were not available. Department of Health and Human Services , the average age of first sexual intercourse in U. Department of Health and Human Services reported in that teenagers are delaying sexual intercourse and other sexual activity until older ages. In humans, sexual intercourse and sexual activity in general have been reported as having health benefits as varied as increased immunity by increasing the body's production of antibodies and subsequent lower blood pressure , [] [] and decreased risk of prostate cancer.

Sexually transmitted infections STIs are bacteria , viruses and parasites , which are passed from person to person during sexual contact, especially penetrative sexual intercourse. Some, in particular HIV and syphilis, can also be passed in other ways, including from mother to child during pregnancy and childbirth , through blood products , and by shared hypodermic needles. Untreated chlamydia infection can lead to female infertility and ectopic pregnancy.

Human papillomavirus can lead to genital and cervical cancers. Syphilis can result in stillbirths and neonatal deaths. Untreated gonococcal infections result in miscarriages , preterm births and perinatal deaths.

Infants born to mothers with untreated gonorrhea or chlamydia can develop neonatal conjunctivitis a serious eye infection , which can lead to blindness. There are 19 million new cases of sexually transmitted infections every year in the U. The World Health Organization also stated that the "estimated 1. In cases where infection is suspected, early medical intervention is highly beneficial in all cases. They added that "several co-factors may increase the risk of HIV transmission through oral sex"; this includes ulcers, bleeding gums , genital sores, and the presence of other STIs.

In , the World Health Organization estimated that million women become pregnant worldwide each year, and around 87 million of those pregnancies or Approximately 46 million pregnancies per year reportedly end in induced abortion. However, many more women become pregnant and miscarry without even realizing it, instead mistaking the miscarriage for an unusually heavy menstruation.

This data includes live births, abortions, and fetal losses. It has been linked to atypical levels of dopamine, a neurotransmitter. This behavior is characterized by a fixation on sexual intercourse and disinhibition. It was proposed that this 'addictive behavior' be classified in DSM-5 as an impulsive—compulsive behavioral disorder.

Addiction to sexual intercourse is thought to be genetically linked. Those having an addiction to sexual intercourse have a higher response to visual sexual cues in the brain.

Those seeking treatment will typically see a physician for pharmacological management and therapy. It is manifested by hypersomnia and hypersexuality and remains relatively rare. Sexual activity can directly cause death , particularly due to coronary circulation complications, which is sometimes termed coital death, coital sudden death or coital coronary.

Sexual intercourse, when involving a male participant, often ends when the male has ejaculated, and thus the partner might not have time to reach orgasm. In , scholars from the Kinsey Institute stated, "The truth is that the time between penetration and ejaculation varies not only from man to man, but from one time to the next for the same man.

But he didn't ask if the men or their partners considered two minutes mutually satisfying" and "more recent research reports slightly longer times for intercourse". Anorgasmia is regular difficulty reaching orgasm after ample sexual stimulation, causing personal distress. Vaginismus is involuntary tensing of the pelvic floor musculature, making coitus, or any form of penetration of the vagina, distressing, painful and sometimes impossible for women.

It is a conditioned reflex of the pubococcygeus muscle, and is sometimes referred to as the PC muscle. Vaginismus can be hard to overcome because if a woman expects to experience pain during sexual intercourse, this can cause a muscle spasm, which results in painful sexual intercourse. For those whose impotence is caused by medical conditions, prescription drugs such as Viagra , Cialis , and Levitra are available. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack.

Sexual intercourse remains possible after major medical treatment of the reproductive organs and structures. This is especially true for women. Even after extensive gynecological surgical procedures such as hysterectomy , oophorectomy , salpingectomy , dilation and curettage , hymenotomy , Bartholin gland surgery, abscess removal, vestibulectomy , labia minora reduction, cervical conization , surgical and radiological cancer treatments and chemotherapy , coitus can continue.

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