Pfft, yes, all the time. Most recent I can think of was a girl in a bar. First thing I noticed was her clothes (I'm quite clothes-orientated) and her cute smile
Always had a thing for guys in nail polish (not just saying that because of your example...) fingers rather than toes though!
Professionally while I was still working, a co-worker came up to me and asked if I were ever planning on becoming a contractor for my profession. When I told him I've thought about it, he said he would hire on to work for me in a heartbeat.
Personally, I was volunteering to teach some classes for cub scout parents on how to make things more fun, and I was asked during the course if I was a professional team builder because of how motivational my presentations were.
Sexually, I had a fuck buddy who informed me that she had met a woman and would be reducing our time together. Then she asked me to show her a technique I had been using on her using my tongue, teeth, and lips on her clit because she wanted to show off to her new GF.
I do have lots of sexual fantasies all the time about guys I see in public, but I wouldn’t really consider them obscene.
A few years ago (oops, of course I was over eighteen!) I used to try to make the shoe salesman have an accident when helping me try on sexy shoes that sandals.
I had one too many drinks to drive, so I walk home. He followes me from the bar, until he draggs me into the alley. I kick, I curse… until his fingers make me moan. And then im left with his seed dripping out on my way home. I never see his face.