...my room mate at uni's boyfriend did that and she bit his tongue really, really hard. Everyone woke up and we had to stem the flow of blood with a tea towel, he had to go to casualty ...it was all very traumatic and he had a bit of a misshapen tongue afterwards.
i got bitten somewhere else and yes it hurt wasnt even a girlfriend just some women me AND a mate pulled.we were 16,she was 30 odd.she bit mine while he was banging it,ahhh the good old days
my wife never moans or nothing,can do no wrong in her eyes,used to bang her when i were 16 too so we were childhood sweet hearts