This post uses one naughty word; consider yourself warned.
Here’s a suggestion: get a mirror, a nice big one, and hang it beside your bed. Why? Because it is damn hot to watch your partner and yourself in the middle of sex. I discovered this by accident because MM rearranged some furniture and ended up leaning a mirror against the wall next to his bed to get it out of the way. I didn’t really pay any attention at first, but the second or third time I was at his house, in his bed, I caught a glimpse of us in that mirror, naked, thrusting. And it sent my temperature way up. Now when I think of that mirror and us fucking in the bed next to it, it’s all I can do to not drop everything and head to his place for a little afternoon delight.
And you? Have you found simple things that have (unexpectedly or not) ramped up the heat of your sexual encounters?