I am older, and wanted to say there have been a few random guys who were enormously sexually attractive to me but not on their looks or personality or anything, and I always figured it was just some sort of biological compatibility, that my body recognized they would make healthy babies or something like that.
This sounds similar to what you have going on here, and it's safe to ignore it. It is puzzling, that feeling, but no way does it mean you'd get along well with someone.
No, probably not, and I live in a mid-sized city, so between metro and suburban I guess. Again, I do think it would be safe and overwhelming percentage of the time just wouldn't FEEL safe.