The process breeders use to breed snakes, like lower temps, lighting, reintroducing the snakes, ect... is to increase the odds for them to breed. You can do nothing and the snakes can breed. Having more than one snake in an enclosure is not recommended, There will be an area in that tank that is most desireable. They will lay there one snake on top of the others. Looks like they are cuddling, getting along very well. NO!the one on top is showing dominants. the ones under that snake is being stressed by it. which will lead to problems. I had two normal females in a large tank ( ran out of rack space ) until I was able to build another rack ( not too long ). one ate and the other didn't, both snakes very close in size. when my rack was complete both snakes ate with in a week. building the rack was high on my to do list for the reason everyone posting here is telling you. If you don't have the space, then do the right thing for your animals and keep only one, and get a smaller enclosure, bigger is not always better.
My question to you, was this a question that you was looking for an answer that was best for your snakes, or the beginning for your debate?