Enjoy every stroke. Slide your hand over your cock, dig your fingers into your cunt, or thrust into your lover and then stop. Think about that stroke you just felt. Smell the sex in the room. Hear the beating of your heart. Look at the act of sex itself like you were looking for the first time.
Before you grind away at each other for an hour, before you pump your cock looking at porn, before you manipulate your clit for the duration of a sexy story, take a moment to really appreciate how even just one stroke can feel like heaven.
Stroke, stop, feel.