"i personaly loved agony and its brutalness because its a way to get our more brutal nature out without harming others" : agreed, actually this concept already applies in most action (non-h) games CS, Warhammer, GTA, Mortal Combat, God of War...
"so someone with a pussy and someone with a cock" : i also prefer this type of setup, in case of futa it makes the char more unique and special. Which is why in my games i prefer futa x female, then by possibility i'd have futa x futa.
Thank you for sharing a personal perspective on the subject ;)
Cheers,
~NK