One filmed scenario, one TV:
> Filmed: In an old DWW movie, Mel and Eva went at it a lockerroom, then carried over into a shower. Although it was scripted, it was amazing neither of them got hurt on the hard, slippery tile. The fact that they were willing to put their body on the line like that for their fans was almost more impressive than their real boxing matches.
TV: On the NBC series "Chuck" Yvonne Strahoski and Nicole Richie had a long fight in a high school lockerroom (in the episode, they had been high school classmates and were at their Reunion). Again, more than a trivial chance they could have been hurt in filming, and impressive they were willing to expose themselves to that hazard.
Bonus--IRL: I'm old, and this will show how much the world has changed (in 1975, lesbian affairs were more scandalous than teacher-student affairs); but at my high school, the very young, very attractive high school gym teacher had once accidentally set up concurrent make-out sessions in her office [which was adjacent to the showers] with 2 senior coeds. The two coeds figured out they were rivals, and started swinging on the open-floor shower and had to be broken up by the school janitorial staff. The gym teacher wasn't in trouble for the teacher-student hanky panky, but was in big trouble for f-on-f hanky-panky.