>>713187453 (OP)Here are my two thoughts on it:
1. Developers now want to create "strong female protagonists" who are not damsels. I believe that consciously or subconsciously people believe that if a woman loves a man, and thus has sex with one, she is submissive because she is being penetrated. They believe the person being penetrated is the lesser or bottom in a relationship, so therefore they make them all lesbians, bisexual (lesbian), or asexual.
The same would go for men. If you had a protagonist who you found out was gay, and then found out he was a bottom, would you associate him with masculinity or strength? You'd view him differently has he is the one being penetrated.
I also believe this is why female protagonists are given masculine traits, such as stronger jaws/chins, smaller breasts, larger waists, more muscle, etc.
2. They still know that men are their primary demographic and are perhaps afraid that a story in which you play as a woman and get fucked by a man is "gay" and that men wouldn't like the idea. This one I feel like is less likely though.