No men and trans yes. As for submission of slaves - Will add to todo list.
For men idk. I have always had thought that in real post apocalyptic world noone would want to trade slaves (maybe work force) BUT I think there would be a lot more males than females in real post apocalyptic world and females would be primary used as sex slaves.
On the contrary, females (young) would be a lot more valuable and in number because they can breed and produce warriors and daughter so more broodmothers!
There will be a lot less male because there will be permanent wars between clans for power ...
You can also consider that a woman with no valuable job (for example medecine related) lost half value after 30 and have no value after 50.
There is no need to wait for an apocalyptic world to see that, just look at the last barbaric wars during the last 50 years...