Agreed. That much muscle tension (on his part) and balancing concentration (on hers) makes quaking orgasm wave all the harder. (pun intended)
And by having a flat surface like a bed under them she can rest her weight on her knees and lower legs, which not only is more comfortable but gives her more control in case she wants to rotate her hips or change speed or direction, and at the same time it frees the man up to do the reverse V with his first two fingers and thumb to help her along while using the other hand to give her a nice breast massage.
This had to have been made by some 20 something. They always think it is about the crazy positions they've seen in pron when IRL if you want to curl a woman's toes the FIRST thing you should do is make sure she is comfortable. Won't nothing turn a toe curler into a so-so like having to worry about balance or weight distribution! 
How you doin'?
Quite well, thanks. Although one of the reasons I broke up with my last GF is she kept throwing the time out right in the middle of things. I guess three in a row was her limit, sigh
I tried to warn her there is an old saying about us bass players: we're the ones that are masters of finger technique and we do so love to play!
There is nothing more I can say to you without sounding like I am straight out coming on to you.
And the Kids in the hall used to say that nobody likes the bass player! 
But if you want to actually hear a couple check out "Sober tripper' on Facebook, that's my band. Just excuse the sound quality as those were recorded on a little handheld digital. My guitarist and I are currently recording our album in a little digital studio we've built and just threw those pre-studio tunes up as a place holder. Sadly we had to let the drummer go because he liked his booze a little too much.
Anyway check 'em out if you like and yes the one with the big red bass? that'll be me. I especially like the one "Down on the bottle" as I got a nice dark tone on that one. Anyway we have like 40 songs written so I figure when we are done recording we'll just put them up somewhere and let the audience vote on which songs go on the album, be happy to send you a link when we have it up if you like? We're shooting for late Oct/early Nov. Be glad to get back on the road again!
hairyfeet
Cute drawing but anyone who has tried that position IRL knows it is VERY unpleasant. The woman has to balance all her weight on the feet while maintaining balance (or the guy is gonna be in a LOT of pain if she slips) and keeping your shoulders locked behind you like that will give the guy a hell of a muscle ache after awhile.
Give me a nice soft bed behind me any day of the week. Not only does it keep you from cramping but it frees your hands which if you have ANY skills at all will be much appreciated by the woman.