Is this breeding behavior, or a threat?
 

I introduced a couple corns to the rest of my corns and one of my corns which I was told was a female started twitching when a known male came up to it. I'm kinda nervous because the female is 2 ft long and the male is a juvenile...but there not fighting. They actually enjoy eachother because they were coiled up together under aspen bedding. And its not a tail twitching, about the front half of the female twitches. Very interesting.

The twitching/jerking motion is a normal breeding response. I would suggest not housing opposite sexed animals together until they are of appropriate size and age to avoid breeding when they are too small or young which could result in egg binding or other problems.

That helps me out too! My amber girl was doing the same thing when I put my male sunglow motley with her!

good to know. I just read something about cannibalism and I got worried. They seem to be doing fine except my females keep shaking haha. I seperate during feeding so I dont have to worry there.

At what age can males start breeding?

Males can sometimes breed their first year but I would suggest waiting until their second. For females I would suggest 3 years and at least 3 foot.