This thread is making me laugh, the amount of double standards and ignorance is astronomical, if it were a numerical value it would be over 900.....(see what i did there)
First, Just because you have sex, dosent mean you will get pregnant or catch a disease, health class gives you the worst possible scenarios so that if it does happen you cant say you didnt know. Chances are she is on birth control pills or some other form, and as someone suggested most likely uses condoms for random encounters. I'm not saying that she has never gotten something, or wont catch something down the line, but being somewhat intelligent she probably knows the risks and that if she takes off a dudes pants and sees an army of bugs flying everywhere or massive sores, she might think twice about that one.
Second, 900 different guys is impressive, normally porn stars are the only ones who can pull that off. However she is one girl who finally realized what guys have been saying all along, as a semi attractive girl all she needs to do is walk up to a guy say "hi lets go fuck" and she can get laid. If the world worked that way for both genders there are few guys out there who would have numbers under 900.
Third, assume the following hypothetical, 900 guys, fucking each guy once (which isnt the case) would equal sex 900 times. Those of you with long term girlfriends, how many times have you fucked? Is she still tight? Does she know what kegals are? Get where im going with this?
Fourth and final , a chick who bangs 900 dudes in fine in my book, just as a dude who bangs 900 chicks is golden. Most of you are probably just jealous that one of those wasnt you.