Have never, and could never, do that to a complete stranger.
I did, however, have a similar experience with a female friend...
A few years ago a buddy of mine was having a bridal shower for his fiance at a banquet facility and I was asked to stop by afterwards to help him load the gifts. We did so and went back to there place for a few drinks.
Back at the house there were about 15 people sitting around drinking. I had jumped behind his bar and was serving a few cocktails. This girl that I have known since childhood was there sitting at the bar. She kicked off her shoes and put her feet (in black hose) up on the bar. I should mentioned that although I would classify her as moderatly attractive, I have always found her feet to be near perfect. Not kidding... damn near perfect.
I should also mention that I was hung over from the previous evening, and for some reason whenever I am hung over, I am EXTREMELY.... horny. Not sure why, but I've always been like that.
Anyway, it took every once of restraint not to touch her feet which were only a couple of feet from me. I had seriously contemplated making a move on her, but that would not have been a good idea. She might as well have spread her legs and put her tang in front of me. I used every ounce of restraint I had not to stare, and was ready to run off to the bathroom to relieve myself. That's how bad it was.
I decided that the temptation was too much to control, so I walked from behind the bar to get away from the situation. To this day I am still proud of myself for controlling my urge.