Logic, I guess? No video game developer on the planet is going to pay focus groups to determine just how sexual is too sexual because most people aren't going to have the same answer. That's why ratings exist. Sexual content was listed. In this case, OP gambled and lost. A collective shrug is really the only feasible response to this post. Being sympathetic to this person for complaining about a situation that they put themselves into is weird.
I don't want to fall to bits 'cos of excess existential thought.