Sometimes Lucy & Ethel's cleavage shows a tiny bit in some episodes.

Ricky is shirtless & takes a shower & bath in some episodes. No nudity is shown.

Ricky spanks Lucy in several episodes.

Lucy and Ricky share passionate kisses. Ricky kisses Lucy's neck in a few episodes.

Some gun use but no one is ever hurt and it's always for laughs.

Some very, very mild and brief comic violence in some episodes.

Some racism but it's never encouraged and often Ricky is the smartest and most successful in the room and his English is much better than Lucy's Spanish

Men give Ricky bottles of beer at a party. Fred & Ricky can be seen drinking beer in some episodes.

Lucy and Ricky smoke cigarettes occasionally. Infrequent and very mild drinking, but this is just at parties and things. Nobody gets drunk, with one exception (see below).

In a famous episode, "Lucy Does a TV Commercial" (Season 1, Episode 30), Lucy becomes increasingly intoxicated from consuming a bottle of health tonic with high alcohol content. Played purely for comedic effect.