You can't really go by color / build alone for sexing. Your "female" is smaller than your male who appears to be a young / small adult. It's, therefore, quite possible that your female could be a male who hasn't developed its color yet. Fortunately it's easy to accurately sex fence lizards at any age. Flip the male over, just past the vent, you'll see a pair of enlarged scales. Your male is also old enough to have femoral pores. These pores are found on the underside of the rear thighs; look at the last row of big scales on the underside of the rear legs. In males, the pores in these scales are enlarged and secrete a waxy substance. Now check your female. Females will lack the paired enlarged scales bellow the vent, and their femoral pores will be much less developed.

I've attached a couple of pictures to help you with sexing. The fist is the underside of a male, the second is the underside of a female.





I've never actually tried / had the opportunity of incubating fence lizard eggs. If you look at my response to the post on eggs bellow, you can see my recommendations.

-Alice

P.S. If you have any trouble finding the features I'm talking about on the lizards in the pictures, let me know and I'll try to add some arrows or something

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