Have you ever ever seen sex pests in your place of work?

We had a guy who worked with us who has since moved on (Unrelated to issue). It wasn't so much that he was a sex pest but he did come across as a bit intense and a bit creepy with some of the women working in the office. Offering comments on how well they looked etc. Fine if it's a proper friend talking to a proper friend. But not just co-workers.
He was not Irish, was Turkish so it may have been a clash of cultures more than anything. We (just the lads, not official) told him that he should stop. That he may have meant it as a compliment but we explained that the office was not the place for it and that it came across as creepy and weird and made the women uncomfortable. (Everyone really but, of course, especially the women) and not done here in Ireland. He was genuinely confused and thought we were making it up until HR contacted him.
In no way am I justifying his actions in saying that it was mainly a clash of cultures - He should have stopped the instant we told him to and there is NO place for any kind of abuse. But just stating that sometimes this can be the case.

In our case, the guy asked us "Should I buy her flowers as an apology?".....NO!!!!!!!!!!

Everywhere I worked the people in management have been female, the few blokes have been no bother but we did have an incident in my last job where a contractor would be very sexually explicit with the young girls on site, I'm talking girls in their teens, he was in his mid 50's. When us older gals got wind of it we sorted him out, he was eventually let go but for the few weeks he remained he never troubled the girls again