OMG i love dan savage too!
i think people just have a total misunderstanding about what makes a sex act homosexual as opposed to heterosexual - and quite simply its only homosexual if you're doing it with a member of the same sex. and i think too many people assume all gay men are having anal sex all the time.
as to the original question, no, i haven't ever done this and i'm not sure if i ever would mostly because i don't see my husband asking anytime soon
but props to the people who do this and enjoy it. do what makes you happy!
- m