If you got your leg blown off, would you still feel in the leg for a while? Like how when spiders' legs get pulled off they continue to move for a bit and chickens run with their head cut off. would the nerves in your legs work for a short time?
Maybe she is real, but not really his girlfriend. He just has a crush on her, therefore calls her his girlfriend. and 'having love with her' = show her his 3 incher.