Lol, those are 3 cute boys. How old are they already?
Between the ages of 3-6 months, rabbits achieve sexual maturity, which is when you may see hormonally-driven behavior issues. This is also the time to take precautions to avoid unplanned pregnancies.
Regarding sexual life and the more interesting fact, you can Get More Info online. You have to be really careful with the rabbits when they are mating. Since Mating takes place quickly, with the male rabbit riding the female rabbit with his forelegs and his jaws clutching her neck.