No, it really doesn't. In fact, if you do something sexual to any person at all, whether or not it is assault depends on whether they consent. Correct. If someone is offended by something but consented to it, then they may be angry, but there was no assault. OK. If that's the case, then anyone who performs such a prank is guilty of sexual assault. Let's take an example. A woman gets drunk at a party and passes out. Guys take turns undressing and then posing with her open mouth millimeters from their genitals. (Might be touching; can't really tell from the picture, but they all say they didn't touch her.) They show the pictures around. Then when confronted on it, they say "hey, it was just a prank!" She is horrified that someone would do that to her, and says very clearly it was not OK with her. In your view of the world, is that assault? Again, offense doesn't matter. It doesn't matter if she was offended, or horrified, or just angry, or depressed. What matters is that he didn't ask, she didn't consent, he then did something sexual, and afterwards she said that she didn't consent, wouldn't have done so and that she was not OK with him doing it. THAT is what matters. True. He might have been the next Harvey Weinstein. Fortunately, he was not.