I really like the 2nd pic of the guy in green, although they are all hot.
The last pic of the guy pulling his dick out of his pocket reminds me of a funny story. Once when I was a teenager, I was in the library reading The Joy of Sex. I got a boner and put my hand in my pocket to adjust it. The pocket had a hole in it, so I figured I'd put my dick through, and could discreetly hold my dick in my pocket while looking at the books. As I was pulling my dick out, a hot guy around my age turned the corner and caught me with my dick sticking out of my pocket. He quickly turned around and walked away. I moved to a different section of the library and pretended to look at books, and he did the same, but we kept stealing glances at each other. I was mortified at the time, but looking back on it, I'd like to pretend that he liked what he saw and was turned on by it, and that to this day he fondly remembers the time at the library he caught a guy with his dick out.
Oh, OK, probably not.