I've done that many times, not by choice but by circumstances. Scenario: Marketing manager (me) goes to meet with a customer to help out the Sales team (female) in a complex situation at a customer. We fly into town from separate places and need to meet in the evening - the only time we have - to prepare for a customer meeting in the morning. We know each other and are friends, so meeting for drinks and dinner is not terribly awkward. But, after a few drinks, I realize I'm sitting here with an attractive woman (they're ALL attractive after a couple of nice expense-report martinis). The mind strays. Oh gosh, is this starting to sound like a PentHs forum story?... I would *never* do such a thing with a female on a 1 on 1 basis.
I got through it with no incidents. Fortunately for me, the women were professional and not "prone" to the things that were creeping into my drunken mind.