That's correct...most snakes don't do this to us, lol. Mine just happened to figure out how to torture me...
Another related thing: after mating only ONCE, some snakes will go ahead & lay fertile eggs for another year or several* even with no further mating. So think twice before you get into breeding snakes "just once" because they may not follow the "rules". *I had a corn snake that had fertile clutches for FIVE years with one mating.
Isn't nature a hoot!?