They go to a sex therapy clinic, there is lots of talk of sex and masturbation.
A man says "That cream needs to be whipped" and makes a suggestive gesture in reference to oral sex to a woman
Mainly: Katie in her lingerie, and Chazz, (in her room) puts his hands on her chest, but no sex occurs.
Sexual references and lines include:
Chazz says he should be the man because he's stronger and doesn't have a vagina. He then says that Jimmy is flat in the front, just like Ken (the doll).
At the beginning at the national skating federation Chazz says to a girl "Are you an official here? Because you've officially given me a boner."
A scene where Chazz is working out on a treadmill he sings a few lyrics from the Black Eyed Peas song "My Humps", which is a song filled with dirty lyrics that use sex-related terms and references to people having sex.
No real Nudity, girl in skimpy clothing. No real sex. Sexual references mostly.