Music also triggers me ... often in a bad way (as in, I feel extremely sexual with a lot of music, which can get me into trouble - Trent Reznor, Depeche Mode remixes, anything remotely industrial, dance or trip hop), but sometimes just in an emotional way.

Here's my theory: We HPD's are impressionistic and can be influenced by the feelings of those around us. Music is so sensual and emotional. Sensuality + emotionality (i.e. music) = HPD trigger

God, it's comforting to hear the three of you and know that someone in the world kinda gets it.