We've had this with a couple of ours but usually the females for some reason
My poor son James has woken up to find Holly near his face a few times getting a little too friendly with him
I think he has now barred her from his bedroom
The main one that seems to have a problem with getting fruity is Rosie, she seems to like my dressing gown for some reason and will spend hours rubbing herself against it
And a few years ago, I had George who would quite happily spend hours and hours getting randy with a teddy bear
He was actually put on Ovarid to calm him down abit and it didn't work
With the vet, I would just come right out with it.....he's probably heard it all before and it will probably give them all a good laugh during their break
He may have some ideas on how to stop him, maybe you could try and distract him with a dangly toy or something