Black widowworld

In this world all men can only impregnate women once. When males impregnate and cum inside women, their cocks become useless and infertile, permanently soft, their once plump balls shrink, they also then become weak. The men still fertile can live as normal citizens, but if they become infertile they are condemned to be enslaved, to be used to serve the community especially women, working as slaves for the rest of their lives. The females in this world have the objective to become pregnant, they try all their best to seduce their male "victims" dressing very attractive and being seductive. All males instead are much more reluctant to have sex, scared to lose their fertility and masculinity and becoming slaves and weak.