Can you put the same gender of red eared sliders in the same cage?

yes 2 red eared slider turtles can live in the same tank together- I have 2 red eared sliders of my own. If you have 2 or more they must be the same size or else the smaller one will be killed or bullied. Mine are about 7 years old, one male and one female. Once turtles reach the age of 5 they are able to mate. While they are still young they will not fight but once they are able to mate if the female does not want to mate with the male she will fight him off. I am trying to get a new home for my male turtle because he is constannly biting her, making her breathe and has become pretty aggressive. I would not recommend putting 2 turtles in the same tank. Perhaps if it is 2 females they might get along, but I am not 100% sure because I have only raised one male and one female together. When the turtles are not fighting they seem to get along and really care for one another but recently their fighting has overpowered their friendship and I believe the best thing we can do for them is to give one away to a good home.