I'm glad I'm married and (hopefully forever) out of the game, because I can imagine it's even more difficult these days where harassment and creepiness is much more prominently on the radar. It can be a minefield. The difference between flirting (wanted attention) and creeping (unwanted attention) is entirely in the mind of the recipient. So you don't really know which one you've done until the recipient reacts either positively or negatively.