How to Do It I wasn’t prepared for this possibility. Photo illustration by Slate. Photo by Getty Images Plus. How to Do It is Slate’s sex advice column.  Have a question?  Send it to Stoya and Rich here.  It’s anonymous! Dear How to Do It,  My husband (trans man) and I (bisexual cis woman) have been married for eight years and have been in an open, polyamorous marriage for about four months after a lot of talking and therapy. He has another committed partner. Shifting to this new relationship after so many years has been a process, and all three of us have had our insecurities brought to the forefront. But we’ve been working very hard on communicating, and things felt good to me. We knew there’d be more unforeseen challenges, but we believed we could face them together. After years of crisis after crisis, it felt like we were finally able to work toward the future we wanted. Then, a week ago, my husband told me he thinks he might be more gay than bisexual.…