Fawlty Towers (1975-1979)
A few mild sex references are made throughout the series, though they are unlikely to cause offence. In one episode a women is shown undressing and her underwear is briefly visible. In another episode a reference is made of a character trying to 'grope a girl' along with the same character unintentionally touching a women's breasts from another room.
In some episodes a character wears a dress which reveals some cleavage. Nothing suggestive.
A woman undresses in one episode, but her underwear stay on and we only see her from the back. This is done in the background and is not sexual.
A man is seen blowing up a sex doll in a room, but nothing is seen and the scene is very quick.
One episode involves Basil in various situations trying to catch a man sneaking in a girl. Nothing sexual is shown, but various mild, PG references are made and Sybil talks about how it seems Basil is trying to 'grope a girl'.
A few mild to moderate sex references.