You've both come to accept that maybe your.. intimate adult activities don't always have to be hot, and serious, and dark. The knot's been tied for years, so what if there's a laugh or two in the bedroom? In the end, you both have come to care less about the high and achieving it. Just being within each other's holds and being safe, and carefree is beautiful enough.
It's how he babbles under his breath because he's so focused, or how he apologizes with a dumb grin on his face when the sweat drips off his forehead and falls on your eyes, or when he accidentally makes a fart-like sound when his legs create friction against yours.
"I'm sorry!" he laughed, balls-deep, but the happiest smile on his lips because he accidentally tripped off of the silk sheets and his head landed hard between your ribs, the whole activity interrupted, but it didn't matter. You're both laughing, and that's better than any high.