I had a girlfriend who was a devout Catholic. Didn't stop her from fucking on the first date, however, and she made it very clear I had to use a condom as she wasn't taking the pill. After we'd been together for a while I asked her if contraception wasn't a sin in her church, and she replied yes, a mortal sin. I then asked if she wasn't sinning by fucking before she was married, and using contraception. She replied yes, she was sinning, but confession would absolve her from the extramarital sex, which wasn't a mortal sin anyway, and she wasn't using contraception, I was. That was my problem, but as I didn't believe in mortal sin, that was OK. I asked her about previous lovers, and she said she'd always made them use condoms, even the Catholic ones. She loved sex and couldn't get enough, but went to confession regularly and always came back for more. I just couldn't get my head around her logic!