From the shape, location, and frequency of the bruises and welts, I think you are correct. My guess is that she has a very angry pimp who keeps her in line that way. Too bad.
I've wondered the same thing! I "would" say probably from sex, except I've noticed in all her videos, she seems to be ultra conscious of how loud she's being, always very careful with that, especially when she doesn't have music playing. That leads me to believe the bruising is more likely from a frequently angry man she lives with, unfortunately.