Should You Castrate Your Male Rabbit?
This hub is written in response to a reader's question about how to stop their male bunny from humping their leg. They go on to say that they know he should be castrated, but they don't want to put him through that.
First of all, I understand your reluctance to have your little guy castrated. When you love an animal, it seems scary to put them through what amounts to elective surgery. However you should be aware that the humping is potentially just the beginning of the problems you could experience if you don't.
I know you want another answer, a quick fix answer, an answer that will miraculously change his behavior without having him fixed, but I am sorry to say that there isn't one, unless you chose simply to no longer allow your bunny near you, or alternatively, you learn to like the fact that your rabbit humps you. The simple fact of the matter is that male rabbits who have not been fixed will indulge in what humans feel are negative behaviors. They will smell strongly, be more aggressive than unneutered rabbits, and as you have already discovered, they will hump things out of frustration.
You might think that 'getting him a female' might be a solution. It is not. For one, you now have a female rabbit who, if not spayed, will probably develop cancer in the first four years of her life. Fortunately, not neutering a male rabbit doesn't have the same health consequences that not spaying a female rabbit does, but obviously, there are other concerns for you to have to worry about.
Pets are pets and we have to assume some responsibility for helping them fit into domestic life. A male rabbit that has not been castrated is not cut out to be a good pet unfortunately.
So, you have a choice. Don't get him fixed, and put up with his behaviors, or do get him fixed and see him become a great deal calmer and more relaxed about life. It is really up to you. Castration (otherwise known as neutering) is much less risky than spaying, but it does still carry some risks, especially for rabbits. Having said that, I had my female bunny spayed at 6 months and she came out of it fine, so it is simply a matter of finding a vet you trust and more importantly, who has a history of working with rabbits.
You are your bunny's keeper, so the choice is always yours, as are the consequences of those choices. Good luck!