I recognize that another parent wouldn't let their kid play any of those for any reason, and that is respectable. BUT, I don't think that is any reason to restrict a game from having the content that makes it mature.
Exactly. It is up to each person/player or family to decide for themselves what is appropriate media consumption for them. It's why we have ratings.
It is not for us to cry "remove sex and nudity from this game!" simply because of the views of a few (not even all!) states of America.