Spraying HELP needed, any ideas

I have a 6 year old male cat. He lives indoors along with 3 female cats (all older) who have all been spayed. My male cat has never shown any sexual attraction to the mbefore, and I have never had a problem with him spraying things before. About 3 weeks ago we moved, and all the cats came with us. And since then the male has been humping one of the spayed female cats, and has been spraying furniture, and walls. He also makes this howling sounds, and follows this perticular cat everywhere, trying to hump her. HELP! Does anyone knoe how to stop this? Should I get him nuetured? Is he too old? Will that even make a difference? Is there something else that works? Please, I would GREATLY appreciate ANY AND ALL HELP!!

Definitely get him neutered. It's not guaranteed to make a difference at his age, but the chances of it settling him down are good.

Given that you've just moved into a new house, it's likely that stress is playing a role. His territory has been disrupted, and if there have been previous cats in the house (even if you can't smell them, HE can!) that's likely to be upsetting him as well.

There are products around that eliminate cat odours (don't use a scented deodorant as they can encourage him to spray anyway). I can't remember the names off the top of my head, but any vet or good pet shop should be able to help you.

If you do the above and he's still spraying, there are drugs on the market that can be given. 'Feliway' is another possible.it's a pheromone that reportedly reduces spraying, and can be useful in settling a cat into a new environment.