Intercourse or sexual intercourse means in principle is a human action performed by men. But in a broader sense it also refers to other acts that relate or substitute the act of intercourse, so it is more than just referring to a meeting between male and female genitals.
Sexual intercourse may be preceded by copulation, which causes passion in the partner, causing the penis to experience erection and natural lubrication of the vagina.
To begin an intercourse, an erection penis is inserted into the vagina and one or both pairs move the thigh to make the penis move back and forth inside the vagina and produce friction, without completely removing the penis completely. Thus, they stimulate both themselves and their partners until orgasm and ejaculation are obtained. Penetration with the penis is also known as "intromission" or with the Latin name "immissio penis".
The term "penetration" is used to describe the conditions under which the male genitals are inserted into the vagina. It is not forever a ritual that is obligatory to achieve pleasure and pleasure in having sex. Sexual activity without penetration is usually acted by adolescents.