I'm desperate to try anal, but can't convince my boyfriend to try it.

Ive never had a real penis up there before, but I've used various implements in solo sex sessions (cumming with a hairbrush stuffed up your rear is fabulous), but no matter how much I plead, I can't get him to even try. I've begged him; bribed him; offered everything I can think of, but he just replies "I think it's dirty".

I love my boyfriend: we've been together for 3 years, and I think he's the one. I just don't want to spend the rest of my sexual life feeling unsatisfied. Is that too much to ask?