I also luv seeing a hot, sexy dude sporting a boner out in public.
As a college prof, I often see my male students sitting in my class with a raging boner that they're trying to hide so that others won't notice it.
Once I was teaching, and I glanced over at a really hot, sexy student about 21 or so and he always wore very tight Levis. This day, I noticed that he kept touching his crotch for some reason. I quickly glanced down at it and saw--to my delight--that he was trying to "hold down" a whopping boner-bulge that looked about 8" long and very thick. Then I recalled that right before class he had been talking to his girlfriend out in the hallway.
Needless to say, after seeing that, I had a hard time trying not to get a boner myself! :wink: