A very young Helen Hunt plays the lead character, Lena. She is putting on skin-tight clothes in the beginning of the movie, showing her back, but nothing else. Some talk about making love in the same scene.
"Whistler", the bad guy, shows up and shoots at the lead character, Jack Deth. Jack uses his time altering watch and stops/slows time and rescues Lena from being shot. Jack picks up Lena and carries her off, and you see her legs and bottom when he sets her into the convertible Thunderbird.
Lena and Jack become inimate on his bed off-and-on, but there is no noticable nudity. Later, you see Jack and Lena in bed together, but no nudity.
Towards the end, there's some insinuation about one character showering together with Lena.