In truth, he's been taught to distrust a forward woman. It makes him wonder what they want besides the obvious - though, if one is genuinely willing to give the obvious, after seeing his personality and propensities, who is he to judge, he figures. But even he can't recall a single legend where someone was suborned by being invited to feed.
Some ghost of an idea of being gentle sits on the soil in his mind, but it never quite takes root. He doesn't slam her into walls or growl, but he grips her arms tight, and J.R. assumes it doesn't take a genius to sense the tension in his gangly limbs.