most people get too antsy when their snakes dont lock on the first day on introduction. theres a reason most people pair for 3 days on and 3 off. give them some time to get use to eachother. dont remove him until the 3 days has past. then give 3 days break. give him a chance to man up. if he's a first time breeder, it might take awhile. keep pairing til she ovulates is how i do it