I would wonder… I know plenty of very nasty individuals who were, by all guesstimates, still engaging in sexual activities. There is an incredible ability of humans to do nasty things for later reward.

Either she made ‘cleaning’ part of the pre-warm up phase, or the whole ‘disgust sense is lowered when sexually aroused’ thing kicked in AND she was just imagining the dollar signs to get her over the hump. Perhaps both. Add in some drugs and I’m sure she could get herself to a place where it was possible.