Be kind of unclean and nerdy. You know... don't shave, wear clothes way below your age.
If that's not possible, just be plain nerdy. You know, make up something incredibly boring for your job. (TW moderator is fine, historian or geologist are guaranteed sleeping pills as well - just read up on some vulcanic minerals and imagine all the fun you can have "pondering the problems with your new research project"...)

As a rule this will not only make most of the female population leave you alone but most of the population in general. Which is intended, I assume. Gives you more time to play TW games.