protocol to follow
 

I have been going to bookstore for more than a year now, and it seemsthe hottest guys are the ones that most likely lock the door of the booths behind them. Is there a protocol (tapping feet, nock on door, etc) that could let them know that someone wants to fool around without being too invasive and frightening at the same time?
it is frustating to spend so much time walking around having nice specimens inside a locked box!
BTW, these guys are usually the straight ones.