I have never experieneced this before but this happened to me three times over the summer. I frequently pickup bees in front of hives for tests and observation. On three separate occasions, I've picked up a drone and its sexual organs popped out immediatedly after having it between my fingers (with the sound of a bubble being pop from a bubble wrapping). No excessif force was used . I was checking for any wing deformation since most I tend to check out do not fly.
Any thoughts as to why they had an orgasm at that particular moment?