I'll have to do a search around and find where the article is ... but I once read an article that a woman can have orgasm from just anal sex ... BECAUSE if the penis or toy or finger is positioned right it is actually hitting the G-spot. The taint isn't that big of a piece of skin very thin infact, so when having anal if it's done right you are stimulating the vagina too. I don't have lots of experience with anal sex, very minimal in fact ... it is something I wish to explore more though.