What if it's not assault in the sense of grabbing a woman from behind and raping her?
What if it's wandering out of a stall with your cock out, making eye contact with women and smirking a bit 'Oops! Did I forget to zip up? Sorry!' Squeezing past you at the sink. Wanking noises from inside the stall - 'I was just having a shit officer!'
It's going to be all these things because predatory men find ways to stay on the right side of the law and harass women.
We know this. We just had a massive campaign in which women queued up to tell us about these sorts of behaviours. That's why we don't let people with dicks into the toilets.