>>It looks male to me; I see a v-shaped line of pores, and it looks like hemipenal bulges are present. That said, a second opinion confirming or telling me that I'm an idiot will probably be along soon.
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>>You should probably recommend to your friend that sand is not a great substrate for them to be on, too; it can result in impactions in their gut, which can be fatal. The general consensus is that it's less hazardous to adults than juveniles, but if it were my gecko, I wouldn't risk it regardless.
I know... I told him the same thing. I have my leos on paper towels, and told him about not using sand.. but that's how the tank was set up at the pet store where he bought it..
hopefully after reading someone else's suggestion as well as mine, he'll consider it 
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>>0.1 Albino Leopard Gecko - Tigger
>>0.1 Crested Gecko - Pooh-Bear
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0.3 Leopard Geckos - Lexi and Libby (clutchmates), each about 4.5 yrs old, and Lilly - about 3.5 yrs old.