Waiting til he is neutered to bond is a valid suggestion and isn't something you should just discount. There is a reason that it is being suggested, because hormones will cause issues with bonding, and if he is getting his hormones in any time soon and attempts to hump her when she thinks she is the boss, then that can lead to a fight. So waiting til he is neutered will mean there are no hormones complicating the issue, which they very much can do. A hormonal male is driven to mate and so will usually constantly want to hump other rabbits, but humping is also a dominance behavior in rabbits and excessive humping can irritate another rabbit, especially a neutered/spayed one that thinks they are the boss and doesn't appreciate a randy buck constantly chasing them around. This can then lead to a fight and resentment, in what might have actually been a bond that may have worked out if the other rabbit had been neutered first. Unless you can manage to get him neutered just when his testicles drop but before he gets too hormonal, then you may not have issues with the humping.
If bonding now is something you are still going to attempt, then I would suggest reading up on rabbit behavior and bonding, if you haven't already. It's important to have an understanding of what to do and watch out for. Such as, did you have them in a neutral area, one that your female hasn't been in before, one that doesn't have her scent so she doesn't claim it as 'her' territory? Did your female actually attack, bite him, pull fur, latch on, or was she just hopping over the top of him and maybe giving a little nip? If this is all she was doing and it wasn't escalating into circling and attacking, this can actually be normal bonding behavior. It is something rabbits will do to establish dominance, just as long as it doesn't escalate into fighting. To me it sounds like an older rabbit showing a baby rabbit she's in charge, but then I'm not there seeing the behavior personally. I had the same thing occur when I was bonding a new male into a group. The dominant rabbit in the group would hop over to the back of this new male to show he was in charge, but never attacked him. So though this can be normal dominance behavior, it is something that has to be closely monitored as well, as things can escalate into a fight very quickly, and fights can sometimes result in very serious injuries, especially for a little baby bun.