I initially struggled with the feminization of my body as I gained, and I sometimes still do when I am out in public among strangers.
I think that as we grow increasingly obese that both men and women start to morph into a more similar form, and for whatever reason that seems like a feminine form (likely because we associate softness with female parts) more than a masculine form... although there are lots of BHM bears out there who can prove this theory incorrect! Still, I think it's true for many, especially the really large (400 lbs +).
The emergence of my moobs was the thing that initially gave my body a feminine appearance, and I hated them! Growing further, now my genitals are buried in my fat, my hips have grown fat and wide, and my I've developed a big fat butt... all of which has given my body a more feminine appearance, which with the attention and affection of my feeder I have learned to accept (though I still wish I could lose the moobs).
But I did grow a beard, too!