OK, having been born in Hawaii and living there & in Florida on the coast I think I can share some of my conclusions of the "Sex at the beach" act.
1.) Straight on the sand is OK only for BJ's & Doggy style. (Unless it's really windy and then the sand still gets into unwanted places.) If you have been swimming prior and were near the wave breaks, you better get into the outdoor shower first or at least have a SAND FREE shirt or towel to get all foreign debris off and out of your nether regions.
Anything else needs to have the sand covered and some weed & booze to help it be decent. (This way you pretty much ignore the grit until the next day.)
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2.) This is to all the "Fish Fuckers" who like it in the water. Bj's and Cunnilingus are about the only two things that are half decent in/under the water but you better be able to hold your breath as well as Buster Crab could.
Water may be considered the best lubricant on the planet, but not in this instance. As your Dick strokes in and out you are having her natural juices get washed off your shaft and she will be DRY in no time.
If you are at the beach and doing it in the water near the shore where the waves are breaking, you not only get sand in there but the tiny little broken shell fragments as well. (Just so you know, this is NOT a comfortable thing.)
If your Dick is too small around and she is too big around for it, you may as well be fucking the open end of a bucket full of water to get the same feeling. The surrounding water will fill the gap. Lulz
If your dick is Fat & Short and she is nice & tight you might be able to do OK.
If you are a "Minute/Seconds Man" and are able to cum upon the very first initial penetration it might good for "you", but I think she would be left wanting.
If you have any type of length and make full strokes she will dry out no matter how aroused she is. (Unless she has some kind of OOZING INFECTION!!! EEWWW!! YUCK!! DAMN!!) Especially if you can last like you should for any length of time before popping.
I cannot comment on how a Prophylactic will hold up or perform under these conditions as I've never been on the beech or in the water wearing a "Dickie Dive Suite" while exploring a "Glory Hole" or "Cave of Wonders". LOL
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My parting advise to anyone who feels that they just have to do it in the water.
1.) Once you get all the way in, LEAVE IT THERE!! Then just throb it and move side to side and around to rub the inner wall of her vaginal canal and maybe up & behind the opening of her uterus.
2.) From behind would be the best so that you can stimulate her clit with your hand.
To be at the beach and do it out of the water.
1.) Take a GOOD sleeping bag for padding and then find a picnic table somewhere away from easy detection.
2.) Wait till around sunset or a little after and then you can use your imagination for positions and watch the sunset, moonrise, or stars as you go at it.
P.S. Anal sex at the beach is a whole different matter that I have neither the time nor the inclination to get into here at this time.
But I will say this, try coating the palm of your hand with Astro-Glide, KY jelly, or Vaseline then put it palm down into some sand. Now start jacking off with that hand. Lulz