There is a picture of a topless woman in a magazine pumping her breasts using a breast pump. Because she is using a breast pump, nothing is seen.
There are a couple passionate kissing scenes, one where Pam tries to grab Greg's crotch, and the other where they're on a bed and he reaches under her shirt and touches her breast briefly before being caught. Scene is very short and nothing actually seen.
The lie-detector scene, Jack asks Greg "Have you ever seen pornographic films?"
After Greg gets the wrong suitcase and looks through it off screen, jack looks through it on screen and you see sex toys. Played for laughs.
Jack tells Greg that he is sure Greg has had "pre-marital relations" with his daughter but to keep "the snake in its cage" while he's in Jack's home.