We have four rabbits right now. They are all from the same litter. My mom gave them to us when they were old enough to leave their mother. I won't discuss my mom's breeding practices about her rabbits, but lets just say I didn't agree with it....anyway..we have 1 boy and 3 girls. They can mate at 6months of age and the unaltered females pretty much come into heat if you just stick them with a male.
Males are best if they are neutered. An unneutered male can develop testicular cancer and die. I unfortunately know this one from experience. I had never thought about spaying or neutering a rabbit before, until my little black and white dwarf rabbit named Ratfink developed the cancer. He wasn't with us long. If you get a rabbit, I would suggest getting it altered if you can.
OR check out Peter Rabbits. They sell theirs already neutered and they come with a one year health gaurantee.