I have been warming my simus up since last week. I tried offering them food today. Only one male was interested. However, when I placed him with a female, he raced to her and started smelling her, and their tails started twitching (a sign of excitement...usually preceeding mating in most snakes). They carried on for a few minutes until I seperated them because I want the female to feed. There was no mating, but prospects certainly look good!