"Because."

"That's good enough. I don't have to explain myself."

"I prefer you this way. You're more manageable. Better behaved. Less selfish and more attentive to my needs, my wants and my desires."

"Your wants aren't important. My wants are your wants. Yours are just animalistic carnal hard-wiring and we're both far too sophisticated to be reduced to rutting beasts."

If I wanted a neanderthal you'd be wearing a fur posing pouch, sweetie, but I don't, so you're not. You get pretty, pink plastic. Ohhh and the key lives here so you can see it glinting between my breasts."

"Always."