You're not understanding the problem.
The problem isn't the content.
The problem is the MC's reaction, it doesn't feel right or believable.
Here is an example;
In the shower he's hiding behind the shower curtain asking for the towel, if he doesn't care about being seen naked then just walk out and get the towel, thats what I'd do since I personally don't give a shit about being naked in-front of people who have no problem with me being naked.
So either the MC doesn't want to be seen naked and thus this scene is sexual harassment or the MC doesn't care about being naked and thus should have no problem just walking out and getting his own towel.
Its strange to try and have the scene both ways, being too timid to come out and get the towel only to then come out and stand there and NOT get the towel.
Those girls weren't even holding it, it was just sitting there and he could have picked it up.
Another example is with Anna, the MC didn't immediately try to contact her to see if she's ok, in stead she had to call and it took about a week. That doesn't seem like a good reaction upon learning what the MC leaned after he put her in a sex coma.
Its the reactions, not the content itself.