Dear MDJ,
Well I was married to a Woman who unbeknown to me was a practising Lesbian (She eventually got it right and left me, Tee-Hee) that is not the problem....But Transgender Sex?as Rollo Says, Danger Will Robinson....These people are full of STD's....not quite the little present that you want brought home to you....
Given that you discover this,then you really only have a few choices:
End the Relationship...
If the Single life is not your cup of tea,neither having your assetts and Family divided then there is Celibacy....
Maybe live a Philandering Life Style...
If you are even only relatively comfortable financially,crystallising some of your assets to buy a Lady say a couple of times a week,maybe a Month in Phuket every Year still cheaper than the Family Law Court,keeps the Family one unit.....So valuable for the Billy Lids.