About fujos, I've read an interview with the director of June, a (now closed if I'm not mistaken) Japanese magazine that contributed a lot to the development of the yaoi culture in the 70s. He said that, in his opinion, girls like yaoi because it allows them to see and 'experiment' with romantic relationships that are completely equal, since the partners are both male.
He also said that this interest for yaoi usually waned as the young women matured. In his words: "We had authors who wrote beautiful things, then they stopped abruptly because they didn't feel the need to write anymore". Absolutely normal: the more you grow the more adult life, with all its responsibilities, demands your time and energy, and begins to give you pain but also satisfactions and, above all, real romantic relationships. In theory, you shouldn't have the time or the need to fantasize about being rammed by a handsome gay male.
This interview was released in the 90s, now the situation is changed: porn is easily accessible and girls can see the way are women exploited and their bodies fetishized; their boyfriends, often encouraged by porn, may ask them to perform painful or humiliating sexual acts, current technology allows it to be registered in HD and shared with thousands people in a few seconds. So there are people who believe that this "I'm a soft gay boy uwu" is an escape from a kind of relationship (male/female) that is perceived as unbalanced and potentially abusive. I've also seen fujos insisting that gay love is 'purer' than the het one.
So probably a lot of them want to be gay males because they think that in a relationship between two men there is less risk that one of the partners will abuse the other, since it's women who are more often victims of abuse. The problem is they aren't men and they'll never be.
