Don't know how many guys do this or are aware of it, but you can also perform a very pleasurable prostate massage from the outside (probably not as intense as inside the rectum) by massaging the prostate thru the perineum area below the scrotum and right up close to the anus---using the middle finge...

I sucked some milk from my ex-wife's nipples in at least a couple sessions right after birth of our child...was rather sweet and felt very kinky/sexy and she was agreeable and seemed to like it too! Hamster.com has some good clips of prostate massage with fingers or dildos, m-f and m-m, that may inc...