I'm a big guy. Generally don't do selfies for this reason exactly. It's not from one or a small group of individuals, either. I get this as a first reaction from a dozen sources a day, even strangers. I can't smile anymore.
I [F] just wanted to drop you an image of my little guy [M] in his happy place between my thighs. Don't give up hope. Gentle/Mommy Dommes exist and/or may be cultivated. Know what you want and seek it, craft it.