I wold have no problem practicing your form of birth control. congrats, hope it continues to work for you.
Not so sure about it being reliable birth control. I've met a lot of kids who were little shits, so I don't know....
My lady and I love anal and haven't had vaginal sex in years. Anal sex is our only birth control and it has worked great. Not for everyone but it works for us.
My boyfriend and I use this method, too. Except I am on the pill, but that's for medical reasons. Not just to prevent pregnancy. We usually start out vaginally and about half way through, I'll either finish him off orally or he'll finish in my butt. We both prefer anal, so that's the way we do it 9/10 of the time and we save the blowjobs for when I'm on my period. It works. lol.