Chances are, unless you got your male rabbit from a shelter, he's not neutered.
It's amazing what a change neutering brings to male rabbits. Male rabbits naturally want to fight off others from their teritory, and for such a cuddly animal, they can be quite agressive. In fact, many rabbits end up in shelters due to agression problems which could be removed by neutering their animal.
A male rabbit will be agressive not only to other rabbits and animals in the house, but often to you as well, despite your best intentions.
They will also spray urine to mark territory, a messy problem, and will not litter box train as well as an altered male.
If your male is neutered, he will be a much more loving, calm and cuddly animal. He'll be less destructive and agressive.The phrase "They'll be calmer and live longer" applies so well to rabbits.
An altered male will be able to have other rabbit freinds (also altered) without fear of agression or breeding.
And the surgery is safe when done by a vet experienced in rabbit neutering. The surgery is best done after 4 months.
"I don't think altering my rabbit will change his behavior"
To a certain exstent, behavior can be corrected by proper training and correct handling, but even the most experienced rabbit handlers can tell you that it's not enough. Lunging, growling , biting and other agressive behaviors stem mostly from the reproductive emotions in rabbits which makes them want to fight off any competitors. Even litter training can be more sucessful when the rabbit isn't focusing on his hormones.
"I'd like to stud him with another rabbit"
Besides the plethora of behavioral problems in whole rabbits mentioned above, there is the problems with breeding females of any age.
But the most important factor is rabbit overpopulation. A female can have a new litter as soon as 24 hours after the birth of her kits if a male is with her, and she can have anywhere from 6 to 12 babies, if she and they survive. There are dozens of rabbits in every city shelter, and more in private breed rescues, because someone thought it would be nice to breed rabbits.
An uncountable number of unwanted rabbits are released into the wild each year. Even one litter is too many. Don't breed. Period.
"I don't think altering my rabbit will change his behavior"