It seems reasonable to speculate that most aspects of how we are have some kind of relation to our genetic make-up, but that's not the same as there being genes that determine what we do.

How a tree grows is affected by its genome, but also various other factors, such as the soil in which it grows and the way the wind blows and the rain falls.

I can't see that if there's an element of choice in how people behave sexually that is something to be uncomfortable about. In fact the idea that there isn't is a bit alarming. Even threatening, opening vistas of eugenic "cleansing".