In order of most acceptable to least. These are more guidelines then rules as exceptions always exist. It should be noted that this is primarily from a western cultural perspective as sometimes Our Nudity Is Different. Level 9 Baby butt Can't make a diaper commercial without one. Said commercial could air at just about any time slot. The bare behind of a baby in the west is pretty universally considered adorable rather then obscene. Level 8 Hand or Object Underwear Modesty Towel suitable even for children's cartoons provided there are no sexual undertones. If there are sexual undertones the worst rating is usually a TV-14. Level 7 Animated Butts Often TV-14 generally not taken seriously especially if there are no sexual overtones. Level 6 Censor Steam Modesty Bedsheet Generally only seen in programing rated above TV-14 as these tropes almost always carry a sexual overtone. Level 5 Toplessness from the Back Side Boob Thong of Shielding Pretty squarely in the TV-14 domain. Sometimes can push TV-MA. In movies this tends to be PG-13. Level 4 Actual Ass Mandatory PG-13 rating. Rarely seen on TV other then premium channels. Nipple and Dimed Fully exposed breasts almost always carry an R-Rating. They can only be seen on premium channels like HBO. Level 3 Bush Full frontal female nudity in movies or premium television will usually feature pubic hair, a lot of it. In fact the actress is usually wearing a pair of flesh tone panties with fake pubic hair on it. This can sometimes incur an NC-17 rating. Interestingly enough it used to be that pubic hair was considered obscene and therefore was omitted from works of art. As a result the hairless female crotch became sexualized and the paradigm was reversed. Level 2 Male Frontal Nudity Varies depending on context but if it is not a work of art or cartoon it is generally restricted more heavily then the above. It's a known fact that censors can only tolerate so much dick before they slap it with an NC-17 Level 1 Vagina The real thing, no fake pubes blocking the view of the defining female sex organ. This almost guarantees an NC-17. Even premium channels use this sparingly. It often comes up in HBO shows such as Game of Thrones and East Bound Down. Level 0 Full Penetration Usually reserved for pornography however a few infamous movies have thrown it in.
Hello, Unknown Troper. You'll need to get known to lend a hand here.