Too Kinky

Imagine the scene:

You're three hours into a swinging party. So far you've flirted with another couple, embroiled yourselves in a brief but satisfying MFM threesome and you're planning on visiting the playroom to fulfil an orgy fantasy that has always made you both horny.

Then someone whispers something suggestive in your ear and you turn round and say:

"No. That's way too kinky for our tastes!"

What could possibly be too kinky after stretching so many boundaries? What do you consider too extreme? As always, I'm waiting to hear more of your wonderful stories.