Joy of Tights Advent Calendar Day 12

Today we are opening the fertility window

These guys could soon be getting inside their girlfriends tights - look where their hands are

Christmas may not be a time of virgin birth, but it might be a time of non-virginal conception.

Here's what will happen once the tights are off

 OK you want something a bit more sientific - here you go

Something a bit more realistic?

Although this guy doesn't seem to know where to put his crotch.  One for a Darwin award?