That was the case with my dear giant bun-he wasn´t and most likely won´t be neuterd, but other than humping my hand a couple of times, huffing and digging his litter sometimes, that was just about the end of his maturity bout. yes, he was hyperactive, biting bars at that time, out of excitement, but now he acts like every other neutered bunny i´ve read of on the forum- no spraying, biting, humping or fighting anywhere.
so my parents see no reason for him to get fixed unless i plan to move out many years later, take him with me and get him a friend. by that time, however, he will be what is considered bunny middle age though, so i guess that is that.
anyway, my bun had an easy, short transfer from kithood into adulthood.