Sexist jerks try to use 'prude' to silence, but geek girl sees through that mess. The reason they use 'prude' is that they know it's effective. In this society, women are supposed to be 'fun' and 'sexy' with a 'sense of humor'. Strangely, men aren't expected to have a sense of humor about pictures of extremely hung men in speedos in unrelated presentations. And no, the answer isn't to put more inappropriate pictures of men everywhere- it's to put sex in proper perspective.
There's a time for near nudes and crude jokes and there's a time for getting down to business. A professional conference is the time for getting down to business.