Simply because in order to send you pervs in the right direction and to the right place, I have to MSWord with google. So this is literally a copy of the other article (with some adlib).
Anime sex (same as animesex), or coitus or copulation (animated) is a sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both (which is animated for your watching pleasure).