Vatsyayana Kama Sutra Part 2, Chapter 10: How to begin and end the congress, Kinds of congress & Love Quarrels

Intercourse, what it is and how, positions, various methods, bringing variety, usual and unusual sex, communicating before and during intercourse (moaning), diverse regional practices and customs, the needs of a man, the needs of a woman, variations and surprises, oral sex for women, oral sex for men, opinions, disagreements, experimenting with each other, the first time, why sexual excitement fades, reviving passion, quarreling, keeping sex exciting, sixty four methods to find happiness in a committed relationship

Sexual intercourse (or coitus or copulation) is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both. This is also known as vaginal intercourse or vaginal sex. Other forms of penetrative sexual intercourse include anal sex (penetration of the anus by the penis), oral sex (penetration of the mouth by the penis or oral penetration of the female genitalia), fingering (sexual penetration by the fingers), and penetration by use of a dildo (especially a strap-on dildo).These activities involve physical intimacy between two or more individuals and are usually used among humans solely for physical or emotional pleasure and can contribute to human bonding.

There are different views on what constitutes sexual intercourse or other sexual activity, which can impact on views on sexual health. Although sexual intercourse, particularly the variant coitus, generally denotes penile–vaginal penetration and the possibility of creating offspring, it also commonly denotes penetrative oral sex and penile–anal sex, especially the latter. It usually encompasses sexual penetration, while non-penetrative sex has been labeled “outercourse”, but non-penetrative sex may also be considered sexual intercourse. Sex, often a shorthand for sexual intercourse, can mean any form of sexual activity. Because people can be at risk of contracting sexually transmitted infections during these activities, safer sex practices are recommended by health professionals to reduce transmission risk.

Various jurisdictions place restrictions on 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,[13][14] 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 called copulation, and sperm may be introduced into the female’s reproductive tract in non-vaginal ways among the animals, such as by cloacal copulation.