Gecko Genders

Question
Hi I'm Matthew Ihave two Flat-tailed House Geckos and I can't determine the genders.How can I tell the genders apart?

Answer
 The best way to tell is when they are at sexual maturity, the male will have pronounced femoral pores.  These are a line of bumps like pimples that run down the inside thigh of each back leg.  Females have them too but you wouldn't see them at all unless you looked hard.