It can happen, so i wouldnt rely on it as a birth control method. My GF got pregnant from me, but i was off the juice for about 6 weeks when it happened.
Oh it can happen, LOL. I was shooting water because of a heavy cycle and got my girl pregnant. I couldnt believe it. I thought I couldnt get girls pregnat(lots and lots of unprotected sex) and I still did.
Hmmm...That doesn't seem right considering all the posts I see of people getting their girls pregnant on juice. Quetsion to those people; how far where you into your cycle. Maybe your blood levels weren't high enough yet?