The great thing is that readers will largely read in anything obvious, so you can focus on the not obvious aspects - how do the characters behave? Is one vocal? Is one quiet? Are they impatient or are they controlled? Excited? Confident? Shy? Scared? Does being the focus of intense attention affect them in different ways? Do they feel a greater connection? Does that scare them? Some people shut down because it's too much. Other people will chase that feeling of connection.
I don't write a lot of sex anymore because I find it rarely serves the stories I write, but when I do write it, it has to grow the character or move the plot along in some way, and nobody needs an anatomy lesson for that to happen 