The side of hank's rear is shown multiple times (and it is mentioned that the censors at the fox network were trying to get more shown).
Some moderate sexual scenes involving harassment and assault. This includes Cotton slapping women's buttocks, Hank being frisked suggestively by a female police officer, and a golf-player groping Luanne's buttocks while she's employed at a resort. None of this is portrayed as comedic or acceptable.
Hank gets sexually assaulted by a male dolphin at a resort; the dolphin humps him repeatedly underwater (this is visually shown), and Hank is traumatized by it.
A reoccurring minor character, Lane Pratley, is portrayed as a sex pervert, although he does nothing particularly explicit or non-consentual.
Hank watches porno tapes on a TV set in his room, taking notes with a pen and notepad in his lap. The pen sticks, and he shakes it up and down to get the ink running again. Peggy spots this from behind and thinks he is masturbating.
There are some mild explorations of puberty and awkward romantic encounters with Bobby and his friends, including Bobby accidentally seeing Luanne naked, Connie having her first period, and Dooley having his shirt removed and being felt up by an older girl without his consent.
Use of mild sexual dialogue/slang (see "Profanity") including "slut", "penis", "scrotum", "can" (buttocks), "boobies", "phone sex", "hooker", "melons", "narrow urethera", "vagina", "uterus", "virgin", "tomcat", "skank", "inbred", "getting busy", "two dogs a' humpin'", "porno", "lovemaking" and others.
Some characters in mild to moderate undress; more severe examples include Dale wearing nothing but an old thong gracing his buttocks and crotch, Hank in boxer shorts, Luanne in a bikini (with her breasts animated literally bouncing up and down while she rides a boat), and Bobby mistakenly wearing cowboy chaps with no jeans beneath, revealing his buttocks.
Mild references to honeymoons and other sexual activity, including a biker couple talking about how a "pair of assless pants and bottle of tequila got them through the whole night", a train conductor falsely accusing passengers of having an orgy, and Dale claiming that he and Nancy were always having "spectacular sex".
While many parents might pass King of the Hill as a family show and children will likely ignore the sexual references, some parents might prefer to supervise their children while watching.
Contains mild sexual references throughout the course of the series. A small number of episodes contain frequent moderate sexual references as they may deal with sex as a central theme. References are made to sexual education, pornography, foot fetishism, prostitution, virginity and naturism.
A running joke throughout the series is that a married woman is having an affair with another man, and her child is the spitting image of the man that she is having an affair with, unbeknownst to her naïve and oblivious husband.
Any nudity is very mild, and only ever consists of brief moments of rear nudity or nudity that is strategically concealed by objects or limbs.