Sexual intercourse is mostly defined as the insertion of his penis into her pussy, which means a man fucking a woman. Other terms for sexual intercourse are copulation and coitus. Besides the "normal" sex of entering his penis into her pussy, sexual intercourse might also describe other sexual acts, which must be penetrating one of the partners. Sexual intercourse always requires a minimum of 2 persons involved. One person cannot have sexual intercourse with him/herself - that would be masturbation. Typically, when the phrase "sexual intercourse" is used, the common assumption is that a man inserted his penis into a woman's vagina, but it can also mean that any body part of one partner enters any possible body opening of the other partner. Sexual intercourse is restricted in many countries by laws, like for example intercourse with underage persons or intercourse against one of the partners wills. Also many religion try to tell people, what type of sexual intercourse is OK and what type of intercourse is not OK.
Common Types of Sexual Intercourse
Vaginal intercourse means that one of the partners sticks something into the other partners' pussy. The most common type of vaginal intercourse is to fuck a girls pussy in one of the many standard sex positions.
Couple performing anal intercourse: anal sex
Typical oral intercourse: Delivering a blowjob
Other Types of Sexual Intercourse
Strap-on intercourse means that one of the two partners attaches a strap-on dildo to his or her body and penetrates the other partners' mouth, pussy or anus thus doing strap-on sex.