For the record, when I was 22, one of my 22 year old male friends started dating a high school girl (16? 17? Whatever it was, it was technically legal in our country) and I thought THAT was creepy. I’m not saying intrinsically immoral. More like… I mean, honestly, and this might just have been that specific situation, but it seemed sad. In the sense of embarrassing, pathetic. Like, he seemed inadequately mature for girls his own age, and had been rejected by so many women his own age (I’d been one of them), that he had to find a girl young enough that she’d be attracted to him simply because he’s an ‘older man’. I didn’t get close to the situation but remember the impression of ickiness. (It wasn’t just me. Other 22 year old friends of ours also expressed feelings of awkwardness and ickiness about it. It was sort of collectively understood that he was doing something embarrassing and weird.) Again though, not based on some idea of inherent immorality (none of us technically believed in objective sexual ethics at the time anyway), but more because in the context, it seemed to highlight a sheer lack of virtues and competence with women the man’s own age. It was sort of embarrassing to be aware that it was even happening.