I think I'm blinkered as I don't understand submissive men
You don't? But you understand submissive women?
I get not understanding BDSM in general, but this hierarchical thinking with men on top and women at the bottom ... eh, well, it is understandable that you are used to it, considering we live in a patriarchy, but I can't understand why someone would like it that way.
Er... because it is form and substance physically fucking and penetrating a male with a pseudo male member. Probably not top of the list of things your average heterosexual women is turned on by either mentally or visually.
I was thinking more anatomically.
Of course, you can't get pregnant by that, but you also can't get pregnant by performing oral sex on a man, and many women still do it.
A man performing oral sex on a woman also has zero risk of pregnancy, is still done by many people.
I've seen a ton of fanfic by women for women involving two men fucking each other, so apparently, the mental image of a man being fucked with a real male member does appeal to many ... not to all, obviously. But I don't think your attitude is the norm for heterosexual women.