A poster with the screen name semen_sampler posted on the compy forums.
Dear Hogwarts:
I found out an interesting fact the other day. Apparently, semen can be used as an exfoliant, according to several experts. I find myself compelled to see if these experts know anything about what they are talking about.
If you're a bloke, and you have excess semen, I invite you to put it in a sealed container and leave it in the box in the Ravenclaw lab marked "Beauty Regimen".
I will report back with details about how well the experiment went.