A while back I was asked about the appropriate subject headings for LGBTQ topics.  Below is some information about that topic including an explanation of some basic terms and how they have changed over the years.

For a list of terms see the website -  https://homosaurus.org/v2  

How to use those terms in the MARC record:
Code the term in 650 _7 with $2 homoit, with a link to the vocabulary in $0 
650 _7 $a Genderqueer people. $2 homoit $0 http://homosaurus.org/v2/genderqueerPeople