It's very simple actually.. people are uncomfortable with sexuality, because sexuality of any kind has been labeled as something that should make you uncomfortable rather than embraced
its the same with things like games and movies.. people feel the need to speak up about how offensive female character designs are or how skimpy an outfit is because they've been taught by society to do so. it's honestly the dumbest thing in existence and people need to get over themselves and realize theyre adults and not in sex ed class or something anymore.