Chase Meridian flirts with Batman several times throughout the entire film. At one point, she squeezes the rubber pecs on his suit and in the same scene, Batman asks if she's "trying to get under his cape." Chase also slips off her jacket, revealing a tank top as she speaks in a sensual manner.
Chase and Batman also kiss several times. The kiss in the halfway mark is very passionate (tongues partially visible).
It is mentioned that Robin dreams of being naked with a girl.
Dick Grayson saves a girl from a gang of thugs and before he leaves, she asks if the hero kisses the girl. They share a kiss before she runs off.
The Riddler comically grabs his crotch at one point. A cartoon honk sound effect can be heard as he does so.
In one scene, Chase Meridian is sleeping naked in her bed. Her body is covered by the sheets though.
When Chase Meridian is dropped out of a tube, her dress flies up and we see her bottom in a black thong. It only lasts a few seconds though.
Bruce asks Chase out on a date by comically quipping to Chase, "I've gotta get you out of those clothes..." After seeing her confused reaction he explains, "And into a black dress. Do you like the circus?" Brief. Mild.
Bruce and Chase kiss very passionately at the end with Chase moaning softly from it before parting ways with Bruce.
The Riddler has a spurt of laughter, in which after he yells the phrase, "Joygasm!" Making reference to a sexual like pleasure he gets from his actions.