It's not a good idea. The obvious problem with a male/female pair is continuous reproduction. Plus the male can't stay with the female, sometimes while she's pregnant and almost never when she has had the babies. And for a male/male pair, definitely not. Males will almost always fight, and those fights can cause serious injury or even be fatal.
If you want to have a bonded pair, they really need to both be fixed. Best way to do it would be to get your male neutered and then after 8 weeks letting the hormones fade, go to a shelter/rescue that has already altered rabbits that will allow you to do bunny dates to find the right match for your rabbit. Not all rabbits get along, so it's important to find the right companion for your bun.