My my my... It's understandable that they'd have some anxiety over being too filthy or needy for their new master, but anxiety isn't quite the word I'd use for Matt. It doesn't seem to just be Frank. He really seems fascinated by the idea of being seen as just dirty/slutty enough for master to comment on (or rub his face in it while he snaps on a latex glove), but not so much that he's seen as unusable