Sexual intercourse interrupted by withdrawal of the penis before ejaculation.

(formal or humorous) Sexual intercourse, especially involving penile-vaginal penetration.

In terms of coitus.

of or relating to the sex act or coitus

Sexual intercourse.

(transitive, formal) To sexually penetrate.

The first sexual intercourse.

The fear of coitus, or sexual intercourse.

Sexual intercourse in which the penetrative partner does not attempt to ejaculate but rather remain at the plateau phase of intercourse for as long as possible.

plural of coition