So my girlfriend doesnt want to use the pill because she's afraid it'll cause cervical cancer, which is something I'm also afraid of. I normally use condoms, but I hate them, and I dont quite trust them. Spermicides seem like they'd foul her taste or make oral sex really horrible so I'm staying away from those too. Female condoms are just... no.. thats a very dumb idea to me.. I've also heard the.. Nuvaring? Is also very ineffective. My question though, since she's not taking the pill, is there one that a guy could use to make his semen not work? If so, wuts it called and hows it work?