And the last thing that homosexuals want is for the entire world to become homosexual. Like MOST minorities, they want to be allowed to pursue their own interests and NOT tell others what to do. It is usually the majority that insists on imposing a single viewpoint on everything.

There are various SF books that explore the function ( and continued reproduction) of envisioned "homosexual ( single sex) worlds- both male and female. You should read them- most are thoughtful, detailed looks at a societal structured as none are today.