Leopard geckos reach sexual maturity at the age of one to three years. Mating usually happens during the rainy season. During courtship, the male walks alongside the female, licking and lightly biting her side. He then grasps her neck in his mouth. If she accepts to mate with him, she lifts her tail allowing the male to insert one of his paired copulatory organs, called hemipenes. Female leopard geckos can store sperm in their reproductive tracts for 15 months or more. They can lay up to five clutches of one or (usually) two eggs during the five month breeding season, and may use some of the stored sperm to fertilize each clutch. The eggs hatch after around 55 days.