It's been linked at several blogs I read, but in case you haven't read it yet, there's this really awesome proposal for a
What If Captain America were Gay issue.
We know this will never happen in canon.
And the consensus is that this will never happen even as a What If issue.
Why?
Once again,
the answer is toothpaste.
(And once again, I say that the genius of fanfiction is that the answer is never toothpaste.)