I'd like to point out that because of the close proximity of the vagina and anus, they share a lot of the same nerve endings, which means if a guy is doing it right, it should feel good.
Actually to me it's awesome, but I have to be in the mood for it, and I use a Rabbit (a specially shaped dong for those uninitiated) in the front and it's amazing for both parties involved
Unless I end up sh
itting on someone, then it's only funny for me.