Just because they are neutered doesnt mean they cannot or will not get
the urge to mate, it simply means that their matings cannot result in
any kittens. The main benefits of neutering are that they are less
likely to get into fights over territory ot females and also that they
wont have undesirable habits lke spraying in the house. I cannot see
anything to worry about, just male cats doing what is a natural
instinct, be fair to him, he has had his "plums" removed, he still
deserves the chance to have a bit of fun!

TheHermit

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