I think HRT does have an affect in sexuality. Yes, going through transition is an opportunity to reevaluate things. But I hear many stories that people experience a shift in sexuality. Including myself. Sometimes, not enough to switch who we date, but sometimes it is. The stories are just too consistent to be societal. HRT affects us in so many ways, and it is know to have some affect on the brain, so it is not surprising that it would touch sexuality.