I agree. I think most people's natural reaction is, "Eeew, this is something they ought to do in private." It's not "realistic" in movies/tv ... for one thing, they can't take the time from advancing the plot to dedicate to showing the actual duration of sexual intercourse for regular people. And of course, normal people aren't carefully lit and draped so that nothing *normal-looking* shows!
It’s one thing to act like no one ever has sex. It’s entirely different to have to show the graphic details.
Having married couples in twin beds, in those old tv shows and movies, was pretty silly. A married couple can get in bed together, in their pajamas, hug and kiss, say goodnight, etc. *fade out* If there's a baby in the next scene, you know what happened after the lights went out :-).
Apropos of Henry VIII, his relationship with his 4th wife, Anne of Cleves, was rather like 50s television. After some time had gone by and she wasn't pregnant, someone thought to ask her, "Does the King make love to you?" and she replied, "Oh, yes! Every night, he kisses my hand and says, 'Good night, my dear. I hope you sleep well!' and in the morning, he kisses my cheek and says, 'Good morning, sweetheart, I hope you are well today!' "
Anne was repelled by him in the bed chamber, should could not get past his weight and ulcerated leg. And she was not exactly a Victoria Secrets model herself. But she fared better than his other wives getting a clean divorce and a lifetime pension.