Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. How to Do It is Slate’s sex advice column. Have a question? Send it to Jessica and Rich here. It’s anonymous! Dear How to Do It, I am a man in my 40s. The person that I thought was my wife is now my spouse. They (assigned female at birth) came out as nonbinary earlier this y...