When I feel the Fat Tail females are ready, I will put them in with the male again, but quite honestly, that is the extent of my effort and I've have no problems thus far.
Back in my Leo days, once they had matured I would put them together in an appropriate sized cage and leave them year round. Again, doing nothing more than keep them together worked quite well for me.
Of course they all had access to a heat source all of the time as well, and I'm sure the ambient temps changed a little throughout the course of the year, but I didn't really record or observe exact temperature changes (though it sure wasn't cold at any point in time

)
Best wishes,