Hello! I studied this term in college, because I asked myself some of that questions too (even if I'm female). To sum it up, gay romace between two men is interesting for many women because of the gender itself. First, as a man, women would not have to fear pregnancy - it means having fun with sex without that kind of risk (diseases excluded here).......
To be completely honest, yes and no. Given that a lot of yaoi is directed towards adults and aren't graphically things a preteen should be seeing, some parts of yaoi definitely shouldn't be something you are potentially reading. HOWEVER, not all bl is as bad as some yaoi. Are you reading only yaoi, or are you reading shounen-ai as well? For your ag......
5 Question for fujoshis from a gay guy