There is a chance at everything. Wouldn't you rather just use one and void that little, itty-bitty chance out by about 98%¿ My exgirlfriends used to get really, REALLY pissed because I wouldn't have sex without one. If she could get tested for me, but she was also sexually active right before me. Figuring that HIV won't show up on a test for up to six months after it is contracted, she could have still had it and been negative on the test. I just can't find a reason to risk my life because it will "ruin the mood", or because it feels "different".