Michael Douglas—a self-proclaimed “expert on sex scenes”—shared his “secret” in an interview at Cannes.
“You do a fight scene, you have to work out the choreography,” he said. “When you do that you go, ‘OK, I throw a punch, boom, you go back and you come back, you throw, boom.’ You start very slowly and then you work your way up to a faster pace.”
“Well, the same thing, and particularly if you’re doing a love scene, it’s important for the lady that you’re not taking advantage.”
Douglas says its especially important to be mindful of your partner.
“You tell them beforehand when you’re starting: ‘All right, I’m going to put my hand here,’” he said. “‘Is that all right? OK, you put your hand here and then we’re going to go kiss, kiss, and then we are going to go … we’re going to go down.’”
Still, he attests that, “it’s very well choreographed,” by intimacy coaches.
Sources:
https://sports.yahoo.com/michael-douglas-secret-good-sex-174854325.html?fr=sycsrp_catchall
https://ew.com/movies/michael-douglas-basic-instinct-sex-scene-overwhelming-cannes-premiere/