The ejaculate is saved in a wad of animal skin and worn later to help conceive children.
This was an intentional mistake put in by creator Bill Lawrence to represent the core idea of the show:
Some may lay in the prone position and rub their genitals against the bed sheet or other surface, a technique called prone masturbation.
Animal Homosexuality and Natural Diversity.
Authority control BNF:
I was really diggin' at my folks who, when catching me at it, would talk in loud voices in the corridor outside my room.
Popular belief asserts that individuals of either sex who are not in sexually active relationships tend to masturbate more frequently mom and dad fuck son those who are; however, much of the time this is not true as masturbation alone or with a partner is often a feature of a relationship.
Though Tissot's ideas are now considered conjectural at best, his treatise was presented as a scholarly, scientific work in a time when experimental physiology was practically nonexistent.
Prone masturbation means masturbating in a position similar to the prone position pictured above.