I've had a few experiences, and all of them are hot:
1. The one bathroom where I went to college was immensely cruise-y under they remodeled because it made it impossible to tell when someone was coming. I had plenty of fun there getting jerked off by numerous guys and jerking them in return. Not a blowjob, but still pretty hot not knowing who it was tugging on my cock.
2. In grad school, met up with a guy who had a gloryhole. I made sure to establish a lot with him ahead of time that he was clean and that I was as well. He blew me a couple times, and all I ever heard from him was a "thank you" after he swallowed my load. I ended up ending all of that because he got pushy and wanted me to basically come over every day and got pissy if I said I couldn't. Which is a risk of things like that.
3. There's a guy I hook up with now who is a regular. He sucks me frequently, and we started fucking recently. But we never exchanged names or anything too much about our personal lives. So it's essentially the same. Yes I see his face and we make small talk and have gotten to know each other some, but we still don't know names, which somehow makes it so much hotter to me.