The pictures on the walls of fletcher's cell contain node's of women. A few episodes of breasts and clear publc hair and once of a clitoros.

Frequent moderate sexual jokes and slang

Topless women seen on the cell walls sometimes close up breasts of a magazine seen

Fletcher's daughter's nipples can clearly be seen through her top and is mentioned further on in that episode

Infrequent Off screen violence

Frequent non-profane insults

Bastard is used a few times

Whore is used once

In the episode "A Storm in a Teacup" there is frequent talk of drugs and some mild references.

Fletcher sneaks alcohol for everyone

All prisoners smoke and trade cigarettes (snout)

Characters drink bleach and oven cleaner to try and get drunk

None at all, Everything is comical