Speaking of guys swinging their legs . . .
A few weeks back I rode my bike to the trolley stop and boarded the trolley with my bike for the commute to work. At the next stop, a guy in his 30s sat at the single seat opposite me. It was a sunny day and we were wearing shades. I noticed that he was good looking with a lean body. He looked over where I was sitting and checked out my bike. There were no obvious bulges in his jeans. About 5 minutes later, he starts to swing his knees open then closed repeatedly. I couldn't help notice a small bulge starting to protrude on his left side where there was nothing before. Sure enough, I could make out the outline of the head of his penis hanging. The stimulation of his jeans rubbing was giving him a semi. He continued for 10 - 15 minutes. Each time his legs closed, the fabric totally outlined his dick. I couldn't tell if he was doing it deliberately or if it was just nervous energy. I liked the show, yet would have liked to see him get all the way hard.