In bed, implied sex in many episodes. Making out in most episodes. There is an episode which refers to prostitution. Some characters are shown in underwear. In later seasons one character is revealed to be a lesbian - making out only.

Gunshot wounds are shown and there is a decent amount of blood.

bitch, sob, oh my god, hell , ass,

A few cops are hungover one morning at work. There are drug references. Cops are seen in a bar, drinking, many times.