I've tried it... but I really don't enjoy it.
Even when I was smaller...didn't like it.
It's a lil different with like, a woman and a big man, than a man with a big woman. I think it is hard to have sex with a big man no matter what size a woman is... where as it is probably easier to have sex with a big woman (unless the man is also big).
(Big meaning BIG with the stomach and the legs and something with a BMI of over 40, not stocky or overweight...just plain BIG)
With men there is a lot of angling and you gotta make sure enough of the HeeDooHaw protrudes from the body to penetrate.
Also mens body fat tends to be way more dense than womens. A woman can have a big ol' sloppy gut that hangs when she leans forwards...but when she lies back it all just melts to the side and the YeederYodder is exposed. When a man with a big gut lies back...it just turns into a big mountain and you gotta be an acrobat to squat over the HeeDooHaw and darn near do the splits while supporting yourself in order to get it into your YeederYodder.
*sigh*
I watched Brookhaven Obesity Clinic earlier today.