Sexual intercourse, also called coitus, is the usual method for reproduction in mammals (including humans) and many other animals such as reptiles or birds. In the animal kingdom it is usually not called sexual intercourse but copulation or mating. It is the act of inserting the erect penis of the male into the vagina of the female for reproduction and also for sexual enjoyment.
Sexual intercourse is often called sex for short, although that is a slight misuse of the word (see the article sex). It is also called vaginal intercourse or vaginal sex to distinguish it from anal, oral and other forms of sex.
To engage in sexual intercourse, the erect penis is inserted into the vagina and one or both of the partners move their hips to move the penis backward and forward inside the vagina to cause friction, typically without fully removing the penis. In this way, they stimulate themselves and each other, often continuing until orgasm and ejaculation are achieved.
Early sexual intercourseEdit
An STD Surveillance Network study (An enhanced surveillance project sponsored by the Centers for Disease Control and Prevention) from 2009-2011 indicates that most interview partners (61%) reported having vaginal or anal sex for the first time between 14-17 years of age. The average age of first sexual intercourse (or sexual debut) was 15.6 years. Males reported earlier ages of sexual initiation than did females. 22% of males reported sexual initiation between 10-13 years, while 16% of females reported the same. Approximately one-fifth of both males and females reported first sex when 18 years of age or older. Previous research indicates that early age of sexual initiation may be associated with engagement in high risk behaviors which place individuals at increased risk of acquiring sexually transmitted infections. For example, first sex before 15 years has been associated with unprotected intercourse and multi-ple sex partners. A new Iowa State study of nearly 1,000 low-income families in three major cities found that one in four children between the ages of 11 and 16 reported having sex, with their first sexual intercourse experience occurring at the average age of 12. Condom manufacturers have long since responded and offer condoms in small sizes for young people.
Sexual intercourse and spankingEdit
Sex after a hard spanking. Artwork by Wolfheart (2017).
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