Yes, my cat likes to have sex with my left arm. You can see it in the video. I think it’s normal. I accept it completely. I want him to express his natural desires. It does no harm when he does it (except to gradually destroy my dressing gown) and I presume it satisfies him to a certain extent.
I don’t know whether anybody else has experienced this. Cats bite the nape of the neck of the female to keep her from fighting back. This is what you see in the photos.
Update: 2022: He is still doing it almost 8 years later! Every day when I wear this old dressing gown which is now thoroughly trashed ??. So winter is the time for this ritual.
Despite being neutered my cat has retained his sexual urges and his desire to procreate. He is frustrated in expressing that desire because of a lack of available female cats. He relates to me as his surrogate mother and a feline mother. When he has sex on my arm, in his mind he is having sex with his mother. This happens in the cat world.
It is a combination event. He also kneads and purrs. The kneading is a kitten response and replicates a kitten kneading at his mother’s breast to bring on the milk. He’s a bit mixed up? A lot of domestic cats are a little confused because they have wildcat instincts but live in a human environment. This creates distortions to their behavior.
The fleece dressing gown is important I believe because it feels like a cat. I have two dressing gowns and the other one does not elicit this reaction.
You can see his sex-drive in the eyes in this photo:

I think it’s important that a cat can express his natural desires and emotions as best as possible. Sometimes we have to compromise for the sake of safety and curtail these drives. Do you think I’m crazy to let him do this?

He does it while I am watching television sometimes, I just let him do it. Or when I read the newspaper. He’ll do for about 10-15 minutes, in all, which is quite a long time. At first, I stopped him but then I thought it was unfair. It doesn’t bother me. Somebody might think it’s a bit gross. Some people may think I’m wrong to allow it. As I said, I have to be wearing my fleece dressing gown which I presume feels like fur to him! He won’t do it when I am wearing other clothing.
I expect he will stop when he’s neutered (it did not change a thing by the way). He’s never sprayed anywhere (wrong: he sprays outside). He is generally a very well-behaved young cat but being young is a bit manic, driven by his instincts.
At the moment (2015) he goes out on a leash. He accepts his harness completely and likes it now. He knows that when it is put on him, he is going to go out. I’ve trained him to come to me so when he does go out alone, I am hopeful that I can call him back if I’m worried about his whereabouts.
The reason why he goes out on a leash at the moment is because I want him to become familiar with his surroundings. I wanted him to know where the door to his home is. If there is trouble, he can then race back and hide. After all, he is very young. And, of course, I would not let him free roam before being neutered. Update: I have moved home since, and he now free roams but it sensible thank God. Also being young he is liable to be stupid and do things which are dangerous to him due to inexperience.
RELATED: My cat joins me on my walk to buy the newspaper at 06:30 (video)!
I’m trying to make is life as good as possible while also making it as safe as possible. After moving home to a house he is now confined to a garden enclosure and the house.
Below are some articles on so called ‘strange cat behavior’.

My cat is a two and a half years old black male, he has been neutered when he was six months. He started having sex with my legs about a year ago. I also allow him to do it. He is a sexual being and I allow him to express it. 🙂
After 14 years living with 2 male cats, I consider myself fortunate that I never once saw a cats willy. I wouldn’t know one if it poked me in the eye.
Seriously Michael, I hope he doesn’t overdo it and make his penis sore, I saw a cat once at the vets and his had got stuck out of the sheath and he had to be anaesthetised to get it back in, he was castrated at the same time. I think if I was you, if his testicles are large enough I’d get him off to the vets, the longer he is left the harder it will be for him to adjust. He should be having fun playing kitten games instead. It takes a while after the op for the male hormones to settle down anyway.
Could do because we keep them in a suspended state of kitten-hood as we do everything for them.
Alan, that is a very good point indeed! My dressing gown is very soft. My arm is getting sore (because he kneads me at the same time) and so is his willy (not really. It looks normal to me)! I’ll try and say this delicately. Nothing is produced except for a scent.
I think this still applies in many countries today which is why some people might find this article unpleasant. For me it is an interesting slice of feline behavior.
Because he is kneading me at the same time he is starting to hurt my arm so I may have to stop him or wear protective clothing!
The fact that he is kneading me indicates he is mixed up about whether I am his mom or his girlfriend 😉