That's false.
HIV can only get into someone’s system through a mucous membrane or an open wound. The mucous membranes(the vagina or the anus) are particularly vulnerable to this, hence why gays get it so easily due to having anal sex, and hence why down low dudes can give it to women.
It's "extremely rare" for a woman to pass it to a man, and if she did, some weird shyt was going on, not simple vaginal sex.
I can tell you that when you get tested for the virus, the nurses look at you like you're a piece of shyt(because they think you're gay). Then when you talk to your doctor he/she will say something like "if you haven't had sex with a man, you have nothing to worry about" If they feel comfortable enough with you. So I wouldn't go with anything you read online, i'd talk to the experts in person.