I have to say I have to be in a certain frame of mind to enjoy anything being stuck up my butt...Sharni & Lil are right about the prostate, that's the man's G-spot, & hitting it just right WILL blow your mind like it's never been blowed before (warn her before you cum, you could put an eye out with the force of your orgasm!) But if you're not quite up to actual penetration at the moment, I have found just the buzz of the vibe on & around the balls (& just below them, above the ass) combined with a little oral and/or manual can be very....uh, stimulating...

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