What is acceptable behavior for working in an office with men?

If you have a crush on one of them, then look for signs to see if he feels the same. If he has a wife or a girlfriend then leave him alone. Always maintain a professional attitude at all times. You don’t want to make other people uncomfortable around you.

It depends on the situation. Is he married or in a relationship? Back off. Is he single? Best consider office policies before even initiating anything with him. However, if something does occur between you and a (single) co-worker, consider the possibility that the relationship doesn’t work out …how will you cope with being around him afterwards?

Depends on office policy and the person’s relationship status.

what if the person is shy and there are no written office poilicies about this?

Then the rest is up to your imagination