Wellllllllll... I think that doggy is one of the best ways to get full penetration for either sex, but with me, it allows for a li'l etra "exploration". I'm harder to penetrate doggy, but once you're in, go for it. I've taken my ex-bf doggy more times than I can count, and he was Donk-sized. Hi Donk ;)
As far as women are concerned, my female companions always liked it doggie, b/c they said it felt "bigger and more in them". I'm by no means a hung individual, so I couldn't say how penetration of a woman with a large penis fares doggy... let's hear from somma our massive members, no pun intended....
Ok, maybe a little :D