My guess is it's a male -- but can you get a clearer side shot of the vent from the side? With above quite unfocused photos sorry but it's just about impossible to see clearly -- is there a little tube hanging out? If so is it round or pointy -- just like another poster advised you to check in your other thread?
Also I'm kinda confused: your only previous thread I can see was in reference to a Thai Silk -- which you asked about it's sex in 2 different posts -- but this is a Red Dragon. Where is the post about this RD?