I'm making another website about sexuality. Is that against tos? If it is is there any other site like adsense I could use?
This would be considered "mature\adult material" and in that note.. yes it would be a violation of terms of service.
It would probably depend on the tone of the site and if that's the only content. Ask google, maybe with some sample articles included. My site is largely an entertainment blog, but pr0n gets discussed occasionally in blogs, mostly in a "news" context. With lots of snark and sarcasm. I'm certain that Google's aware of the content on my site because A) we had a manual review of the site for Adsense API approval and B) the obnoxious anti-porn crusaders we were blogging about (who are also neo-nazi affiliated bigots) were contacting both Google and any advertisers showing on sites whose viewpoints they disapproved of. I'm reasonably sure they disapproved of my site since I was rather scathing about their methods and beliefs ... So the answer is probably "it depends" and ask Google.