Sex is constantly referenced, both with and without innuendo. There are also many suggestive camera angles and shots, as well as a few scenes with partially naked female characters.
At the beginning of episode 11 it is implied that a man has sex with a fish. Nothing is seen but you do hear some very suggestive noises.
One character admits to "sucking off" another character one time. Referring to oral sex.
One of the main characters usernames is "BallsDeep69." He is constantly referred to my another character as just "Balls."