The and in English is not a logical AND operator that has imaginary brackets around the operands. The concepts exist separatly and if you cite them together with an "and", you do connect them, but not to make them a new term, but to apply the thing said before to both.
A new term would have been sexualized nudity or nudity with sex. As the esrb sees it, they have their own category and you can get an esrb rating separatly for sex, and for nudity, and in varying degrees. https://www.esrb.org/ratings-guide/ They do include partial nudity in "sexual content" though, so you will get that one for free ;-)