The penetration of the penis into the pelvic cavity, resulting in partners being pelvis to pelvis as in the missionary position with
sexual organs being totally obscured by pubic hair.
Repetitions of this procedure are referred to as 'having sex,' '
fucking,' screwing,
etc.
Rick had a bad habit of cumming upon entry with
one simple penetration, leaving
Marsha frustrated and resorting to
masturbation for release.