parker are you a virgin? 
no matter how big the ass is, when a woman is bent over in doggy, the pussy is always right there for the taking. no need to "cut through inches"
[img]http://assesinpublic.adult-collections.com/images/2009/04/Two%20nasty%20wild%20big%20booty%20sluts%20fuck%20hard%20samurai.jpg
check the one on the left. the one on the right just isnt spreading it apart and bending over enough.
Most of the women I've been with are built similar--more like the light skinned one...
Yes the cooter is right there, but as you said, that chick is spreading it out...a woman or you shouldn't have to spread the booty out to cut thru it...if you gotta make her bend over all o ef the damn place and have her spread...then there is a issue at hand...
Now, i can see you having the woman bent way over, where her head is near her knees, so you get the cooter meat, but as I said, I know of women who prefer a larger man, due to having a 40+ inch ass.
And 8 ain't a monster, unless you have Shorty Mac's 8...