Same here, i'd only do kill a female during/before/after fucking her it if it was 95% safe i would not bear negative consequences because of it.
Like if there was a state of war/lawlessness and i commanded a group of armed men doing what we please.
I'd do different things.
I'd rape, make sex slaves, fuck fresh corpses of killed female civilians or combatants, kill a female during sex/during climax.
I'd say on majority i would create a harem to be completely honest, innocent people don't deserve to be killed without a good reason and the sex slaves i would have, would be treated fairly humanly and given all the comforts i could give them.