how the read ear turtles have sex?

ANS HOW DO YOU KNOW IF IS MALE OF FEMALE, I HAVE THREE OF THEM AND I DON'T KNOW
Answers:
Most Red Eared Sliders begin breeding once they are 5 inches in length. It has been reported that size is more important than age for sexual maturity in this species. The mating rituals that occur between male and female Red Eared Sliders are interesting to watch. The males will first spend a long time trying to move the females into a position where they can face them. They then wiggle their long front claws in front of her. After some biting on the neck, the actual process of mating will take place. Females lay a number of clutches throughout the year and the hatchlings are fairly hardy, often times over-wintering, if they cannot leave the nest at the time of hatching. Proper incubation means carefully moving the eggs to a plastic container containing moist vermiculite. Don't rotate them, and keep them right-side up as you move them. Control the water content in the box by weighing it at the beginning and maintaining this weight throughout incubation. Clutches typically contain 12 to 15 eggs and will hatch in 50 to 62 days, if properly incubated at a temperature of 80 degrees Fahrenheit. House hatchlings in the same way you do adults but change their water daily.

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I don't know how to tell them apart, but I would imagine they have sex v-e-r-y s-l-o-w-l-y.

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Qwerty h is correct. The males have long front claws and the females have short front claws.