I think one of the things you are all missing in this question is that the most active sex organ in the human body is the mind .I have both given and recieved anal orgasms for myself i have had an orgasm from just anal and my cock was not even hard at the time. it was a powerfull orgasm but it was not really all that forfilling . as for giving a female sub of mine who is totally into anal has had anal orgasms from the use of a dildo only with out any other stimulations