At what age do BP's gender become visibly noticeable?

[RobNJ]

Never! No matter what anyone tells you, there is no way to physically differentiate male or female in ball pythons.

I'm not saying it's a practice that should be adopted as fool proof...all I'm saying is that it is entirely possible. Males generally have a much lighter build, and their tales are generally longer and not as sharply tapered. I do believe that in adult bp's, it's possible to visually differentiate between males and females with a good degree of accuracy. Is it something I think people should rely on? Not at all.