Just Go Marry Yourself!
This is how you could be happily married in Altered Carbon…
Cross-multi-sleeve.
First clone yourself as the opposite sex. This is not as difficult as you might think. Cloning is not yet a thing in the 21st Century but some are toying with this but not with humans just yet. Still, asexual reproduction for humans with the goal of cloning yourself as the opposite sex seems easy enough so we will go…