What member of "the band"/instrument has always been the one that attracted you the most? Why?
Example: I have always had a weakness for guitar players. A really good guitar solo melts me every time.
No way I could pick one any sooner than I could pick one instrument to play. But there is something extra attractive about watching an already attractive person put on an amazing performance. Although, I dated a girl for a while who was a vocalist and basically sang her orgasms. That was pretty awesome.