Engendered Species and SF

There's a sub-genre of SF where a world with some gender variance is envisaged - e.g. Left Hand of Darkness, where people are hermaphrodite, or Maul, where (most) males are dead - so most of these are proto-feminist literature trying to examine societies without male dominance arrogance and aggression, and are often very fine (and frequently (all?) by women authors...

so its about time we had one where all women died out - the speculation i would have is that society might not become either spartan (gay buddy+violence) or particularly random (mad max, random acts of senseless violence, escape from new york) - without women to SHOW OFF to, men might become civilized:)

as one of trician sullivan's excellent character's says, why werent the wives, mothers and sisters of the concentration camp commandants tried too? They stood by while their husbands, sons and brothers committed those crimes - perhaps if they hadn't been there, the crimes might not have happened...

oh, ok so we need to figure out cloning and stuff, but thats just the standard SciFi McGuffin (backstory)....easy peasy - the hard bit is how socieity would switch as
People of a Pure Chromosomic Nature (women) start to die off...