Lindsay was one time wrapped in bath cloths alongside Beth and Owen in which she peaks down the revealing top of her towel to leer at either her ample breasts or nipple slips.
In the second season, Action, there is little nudity. However, there are lots of sappy make out sections, but not as much as the first season for sure.
A character takes off her belt and her pants, revealing her underwear for comedic effect. (Episode 307).
None In World Tour, besides some kissing and one glimpse of a girl's underwear.
Season 4 has slightly more than Season 3. Jo makes a reference about working out like the Olympians but nude. We see her shadow as she does jumping jacks, and a chipmunk sees this and it pukes. Nothing bad. However, Jo makes a reference to a pubic hair that a younger kid won't understand.
All Stars has nothing except for some kissing.
In multiple episodes, censored male nudity is shown onscreen and in one episode, a female character in a competition accidentally flashes a male character topless, but it is censored. However, censored nudity is played for laughs.
Characters often use slang for testicles.
Leshawna's bare butt cheeks are shown very briefly but censored.
A female character named Suger at one point was eating a very large amount of cabbage and soon started farting a lot. Through the show you can see her butt crack but on this specific frame when she was bent over about to fart you can see that her butt was more detailed and sized up.
People can be shown cheating on their partners as well (like Duncan for example). There is one obsessive female stalker in the show who talks about her crush and is shown to creep him out. There are revealing outfits throughout the show, but they are all meant for laughs. Suggestive dialogue, Innuendo and adult humor can be included as well. Couples can be seen kissing. Male and female frontal nudity are occasionally shown and censored.
Bridget and Geoff often make out in many episodes. For example, they do so as the lights turn off and they make purring noises in the dark, but the noises were removed in the US version.
In an episode, Tyler and Lindsey are shown making out in the communal bathrooms, the walkie talkie rings and they fall on top of eachother.
Harold says that Leshawna is "sexy".