This sounds like an incredibly bigoted, or at best ignorant, stance to take. I think it can be safe to assume that the GP meant that LGBTQ creators can be marginalized based on how they act, look, or simply identify. There is nothing about those 3 things that telegraphs "a man's bedroom activity".
> When they "act, look, or simplify identify," in a way that easily identifies them as not cisgendered and/or not heterosexual, how are they not telegraphing information about their bedroom activities?
Because all they are really telegraphing is a preference for persons to collaborate with in said bedroom activities to be a specific gender, and even that is hardly certain.
In any case there is actually very little in the way of "bedroom activities" that is exclusive to particular gender combinations. Most people are physically capable of performing most acts unassisted with most other people.
And quite a few of the acts that are excluded can be accomplished with an appropriate adapter.
All of which says almost nothing about anyone's odds of doing any particular thing with anyone else.
