I have an idea, we'll write a story, Good old angry marines versus the order of the sacred feminist, eventually you'll realise what you do in any argument about 40k do whatever the hell you want, just ask your opponent,so the fluff says no female space marines, ciaphas cain novel, inquisitor Amberley Vail (<-Female) saves peoples ass's ten times over in power armour, coincidently novel also includes sisters of battle saving peoples ass's, another leading character colonel regina kasteen her bolt pistol might as well be a bmg so what women aren't space marines do you see guys complaining when they can't represent themselves in a sisters of battle army,
1- its a game
2- women are badass when they appear in fluff
3- choose slaaneshi if you really want marines chances are they got high and woke up as a chick (these things happen)
4- if you can't see my point in all of this maybe your just angry at men and not gw.
that is all