Kind of like how some women will say "they never did that" or "were never like that" and then suddenly, you find the evidence that says the exact opposite. Sophia strikes me as the sort of woman that'd pretend and lie just to keep her past hidden, at least from her children and quite possibly from her husband, if people are on the corruption path in the story. It would definitely explain why it's so easy for so many men to influence her lust on that path. Deep down, she'd have to be one of the biggest sluts out there and have engaged in that behavior when she was young, to some degree or another from a logical standpoint. That isn't to say she was riding every dick out there, just that she was engaging in some behavior that would have been considered wild and likely doesn't want her kids or husband to know about. Enough wild behavior to make the corruption path relevant that it can expose that past, make her start back down it and become a wild slut in this game should players choose that path.