General rule is 50g+ for male and female.
I have two females, Lily @ 63g and Nolan @ 48g. Zeus is about 55g. Some people would probably breed Nolan, but I'll pass. She's a conservative eater. Lily is a piggie, she eats all the time. I could try and put some weight on Nolan, like a pinkie, but I don't want to force it either.
I say that now, but who knows. I got a couple pinkies for Lily, post lay meals. Maybe I'll see if Nolan will take one.
Good luck with your project, I'd like to see your geckos.