how could semen cause the pipe to clog? I been cumming in the hot tube and shower for years and it has never clog up except for the hair thing .That DNA chit is so original! don't these assistant director know that kids these days watch TLC and discover channel about DNA and chit? ! good luck trying to match up DNA with a bunch of horny masturbate collage kids! at least it safe sex I dont see anything wrong with that!