I believe I have found the solution. Have gay men marry gay women - there, your married. You simply choose to have an open marriage and sleep with your same sex partner.
Since she is a lesbo, she will not care you are sleeping with a man.
You gay folks need to get together and solve this.
I've wondered if a man who was once a woman has ever married a woman who was once a man.
Of course, it won't work. Even if the imposition of gay marriage -- even if it's actually voted on by actual non-judicial-type people -- is not followed with rampant divorces and a culture of open gay marriage, society will accept homosexuality only to a limited extent.
I could say this probably stems from a psychological need for acceptance that is much more familial, but why speculate on the obvious?