hmm.. last time my friend's male cat did the same too.. the male was abt 8 months old while the female was 1 year ++ old.. same thing happens the male bites the neck of the female.. the female obeyed.. but the male could not get his xxx into the female xxx because of size difference.. the female was bigger.. this went on for quite a while until we decided to seperate them as the female suffered injuries on her neck.. and she never got pregnant