Male skunk geckos do have strongly pronounced preanofemoral pores (see pic: http://www.sonyuserforum.de/galerie/details.php?image_id=55861&mode=search&s=3fcf5a2c4c2ed0a45a4a2a8dc185a199 ) and relatively large hemipenal bulges.
In thi sspecies you also see bulgeds at the tail base in females and even female pores are at least visivle. But the difference in sexes is very obvious in animals older than 7 mnths.

Ingo