Of course there are levels of unacceptable. And the level is above showing someone's adult partner a naked baby picture for fuck's sake.
I'd ask you if there is any level of discomfort that is acceptable? Tickling causes a level of discomfort, but also pleasure. Should I not tickle a child? Punishing a child when they do something wrong causes them discomfort and sadness and anger. Should time outs be considered child abuse?