rabbits humping each other

Question
I have two brother rabbits aged 16 weeks. The vet has confirmed that they are both males. One, Harvey is much larger than his brother who was born with a dislocated hip but is much much better now, just smaller. In the last couple of days instead of being very close and snuggling up together and sharing food etc nicely , Harvey the larger of the two has started jumping all over fudge all the time and basically humping him. Fudge is wimpering and very upset but doesnt fight back but whimpers. What should I do I have only one largeish hutch so cannot seperate them easily should I do that or leave them together and let them fight their own battles. Is this normal for two brothers to try and hump each other. Harveys bits are well all out and enlarged but thenkfully I havent yet had to have the birds and the bees chat with the kids as they just think thats hes being a bully. Also they are inside the house an awful lot and have the run of the playroom. Should I stop this. Am I confusing them by having them in and out doors. With regard to litter training they are both great at weeing only in the litter boxes but poos they just do where and whenever. Harveys are huge poos and fudges are small like normal rabbit droppings. Why are they different and why wont they use the litter boxes of which they have a choice of 4 when they know to wee into them.

Answer
First off, humping is a sign of dominance and is often used by rabbits when they want to assert their authority over each other. However, if they are continuously fighting then they could potentially REALLY hurt each other and should be watched closely, if not separated entirely. Two intact males simply will not live peacefully once they are sexually mature.

Second, pooing everywhere is just a fact of life. Rabbits mark their territory by leaving their poopies lying around. Luckily for us, they are hard, odorless, and easy to clean up. For most rabbits, their litterbox habits improve as they grow older, but very few are ever 100% trained with regard to their poos.

And yes, two different rabbits will have two different poos ;-)

Hope that helps!