I already broke this down in another thread about a month ago but i'll tell you here
its pretty much impossible for a woman to give a man HIV for two reasons
1) BOTH of you would need to have deep bloody cuts and swap blood during sex - HIV has to enter your blood stream like a needle injection, so even if there are little paper cuts or bloody scratches on both of you, you're fine.
also, a womans vagina is VERY hard to bleed or tear - they're designed for a little human to come out of so imagine how hard you'd have to rip her to get her to bleed...
2) a woman's bodily fluid would have to skeet/shoot up inside the hole at the tip of your penis...
to put that in perspective, imagine shooting a spray bottle on your penis and trying to get water to shoot up inside of it...
how long would that take?