I think it's hot, and a guy wearing pink underwear, to me, makes a big statement. One day at work, this guy who I thought was probably gay due to his excessive commenting on details about me, stopped at the stairwell door just outside where I work, pulled his pants down about halfway on his butt, revealing bright pink underwear. When he did this, he turned his head back in my direction and ran his tongue out in a crazy and playful way.
I always thought he was probably gay, but I felt like that day he confirmed it.