SO to put this to bed and bring this back to topic....
Most of the scholarly research you will find will does not break down sexual orientation as Gay or Straight. It is more of a scale, Ritch C. Savin-Williams seems to be the one everyone cites in this space and claims that sexual orientation is more of overlapping scales: Exclusively Straight, Straight, Mostly Straight, Bisexual Straight, Bisexual, Bisexual Gay, Mostly Gay, and Exclusively Gay.
In regard to this concept of Futanari and if you like are you "Gay" is more of how gay or not gay are you? In this regard one would focus on sexual orientation indicators for genital contact.
What you find is below....
Savin states.....
They key point here...is that there is a correlation among other things from same sex genital contact to degree of gayness. So while unless you are exclusively straight...if you like dick on dick action (Futa or otherwise)....one would argue you are not exclusively straight.
There is really nothing out there on Futa and sexual preferences so you need to draw conclusions based on the research that has been conducted regarding sexuality and orientation. Specifically the research that calls out genital contact as not all do.
The articles I cited here are:
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