Yes sissies are very much a thing in the cucking lifestyle. They want to be treated like a woman by a strong masculine bull. Sometimes the sissy husbands join the wife with the bull!
Humiliation is sometimes a part of it, not necessarily their feminine form, but how much of a slutty girl they look like.
SissyMeet.com, Adult Friend Finder, Butterfly, Ashley Madison, PURE, these sites cater to sissy dating, and there are some sites on Reddit too.