Just an opinion:
Sex on the beach sounds romantic and sexy. It's been glorified in movies for years and the added taboo of exhibitionism that Hedo could offer may fire up the naughty images in one's head, but throw in these other items and the desire seems less than desirable.
As mentioned, sand fleas and other insects/creatures not even mentioned as well as sand in places you can't avoid getting it (including hands that are needed for touching), even with multiple beach towels spread out.
Take a shower, leave your room door open and comfortably enjoy one another.
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