When I was a teenager, I took the cover off one of the speakers of the hifi we had at home, then I found the bassiest music I could find (Massive Attack I think), changed the EQ so that bass was at full and everything else was at lowest, then played the music very loud while resting my erect penis against the speaker cone. As I was getting closer and closer to orgasm, I was turning the volume louder and louder till the point where it very clearly was audible to most of the street.
I was inspired to try it out after watching the film Private Parts about Howard Stern.