Ever since he was a teenager he would get a boner when he showered at the gym. Something about being naked in front of other guys caused him to chub up.

He used to be ashamed of his rock hard cock, and tried to hide it. However, recently, he realized that some of the other guys in the shower would stare at his engorged meat. Showing off for them made him horny and his cock even bigger and more rigid. He quickly learned that the guys who stared would often be willing to help him out. With a slight nod in their direction, they would make sure that he did not leave the locker room shower with a hard on.