People looking for gay content would bitch about false advertising, if you tag this one gay.
There is one femboy and only your actions as a player lead you to have scenes with that one. Optionally fooling around with a sissy does not warrant a gay tag.
Also, your reasoning is wrong. If you do play it for "straight" content, you can actually assert your non-gayness by not peeping on the femboy and not fooling around with him. Maybe if you consider this mindset, you could enjoy the actual straight content more.
Oh, and futas have a dick and a pussy. A more western term would be hermaphrodite.