Euphemisms: You can always reach for these. However, they have their place and can easily be overused, becoming boring for the reader. More importantly, when describing a sex scene, editors don’t want euphemism. They want absolutely clear sex. That being said, they can be used in between sex so that your “go to” words are reserved for more explicit scenes.
When off the cuff as innuendo: “You never get tired of my cushion though, do you?” or, “Someone better be filling my well soon…”
When you want to hint: “You’ll get your dessert soon. I expect you to eat it slowly.”
The character trying to sound naive: “He touched…. You know… Down there.”