I agree with your more body types suggestion! As for the rest, though, I don't think Catholicism approves of pornography in general? I'm kind of confused about why you're hung up on the sexuality part when there is so much more going on here, lol. Like, the main characters are literal demons of lust :p
But also, this is an explicitly LGBTQ+ game, with canonically bisexual main characters, and the romance options reflect that. If you don't like the romance option for a chapter, then you are free to skip it.