Ok, taboo "relatively innate".

I can't speak for Bayeslisk, but I'd say it means that things other than what happens to you after your birth have a non-negligible effect (by which standard your accent is hardly innate). But I agree it's not a terribly important distinction.

The common analogy used in the 'civil rights' arguments is to things like skin color. By that standard homosexuality is not innate.

I probably agree. (But of course it's a continuum, not two separate classes. Skin colour also depends by how long you sunbathe and how much carotene you eat, yadda yadda yadda.)