Loool, dude I saw this thread and was like "WTF did I do now?!".
Heres the full .gif that I cut down and made a smaller size so I could use it as sig. My british friend Jpwhits told me it was some british documentary, I really don't know, but if you find it, shoot me an ICQ (in profile) with the link so I can check it out also.
Without further ado, here's the gif:
Hotlink:
http://drewpickles.com/files/1Sex.gif