Trust me, I don't want to marry joe, guys are gross, I don't know how women put up with us, but that's a whole other discussion.
To you question, you can marry, just not another woman.
Which brings me back to my point of removing the word from the equation. There have been a number of people on this thread that have said unequivicoly that they would have no problem with civil unions that grant the same rights as mariage. I think that there are a whole lot of people out there that feel the same way. I would think that those effected would be most interested in the rights they are looking for rather than the word. After you get the rights, call it whatever you want.
So only people that marry in a church get to use 'marriage' or only hetrosexual couples get to use 'marriage'? I personally want the rights, couldn't care less what people call it. I'd personally call our life commitment to each other marriage regardless of whatever euphemism society decides to call it.