SU biology professor Scott Pitnick might be starting a new trend in skin accessories, with the 30cm tattoo of speedy spermy on his arm.

If anyone can pull of a sperm tattoo, it's Professor Pitnick: he's an evolutionary biologist who investigates the evolution of sperm form, spermfemale interactions and sperm competition.

This is one sexy stain a towel won't be able to clean up...