Earlier - NO! Today, i would certainly look for places with 50:50 chance to get caught. Not that it specifically turns me on but i just like to be dirty and filthy.
yessssQuite a few times, if you count 'public' as being a public place but with not one else around. Most often is was due to the combination of horniness and the naughtiness of the idea that someone may catch me.
turns me onOut in nature yes,in the middle of public not really, getting caught by the wrong person could be bad, now do I masturbate in my car, hell yes lol