Everyone here rambling about a bunch of drama and getting all moral, yet Kerpal just stated a fact of life.
Everyone has HPV, has had it, or is about to have it; the only way of guaranteeing you wont is if you and your partner have never had sex with anybody else. There is no test for men, and even if there was, MOST people don't show symptoms.
Most people DO NOT develop warts, and most women who test positive for HPV on a pap smear test, eventually clear the virus to the point where it no longer keeps showing up on tests.
If you have had sex with anybody who's not a virgin, or has had sex with somebody else who is not a virgin, then you have been exposed to it and most likely gotten it. MOST WOMEN YOU HAVE SEX WITH HAVE IT, and DON'T KNOW THEY DO. The only reason this one mentioned it to the OP is because she actually knows she has/had it, due to a positive pap smear and/or warts, and actually had the decency to tell you about it, knowing you'd get all judgmental, even though YOU ALSO HAVE/HAD IT AT ONE POINT.
As somebody mentioned already, be glad it wasn't HIV, and more important, what the hell are you putting it in bareback?
There is a lot of good info on this site regarding hpv and other std's. Here's one post to help you relax a little, hopefully, and dude, wrap it, don't be a dumbass!
http://www.medhelp.org/posts/STDs/Qusstions-for-Dr-HHH-Please---HPV/show/1093766