Civilization has collapsed. Gregory documented one occasion particularly well.
Men like Rauching likely did not fight like Rambo. Most men di not fight like Rauching... but many did.
Af for women, they might get men killed, but rarely did they succeed in consistently fighting men on even basis.
What limited "prostitution" was not lack of money as such - women could and would prostitute for food when cash is not circulating. Rather, it is the collapse of large social groups such as towns. Merovingian France certainly had "whores" in the sense of "sluts". But in a small scale society, a woman could not support herself entirely by retail prostitution, without other attachment. Too small customer pool.