"Do you know why I don't?" He didn't bother to wait for an answer, continuing to speak against her skin, kissing between words. "When we were young, Thor didn't have control of his powers. He electrocuted me on a regular basis, which didn't hurt much but made my hair stand on end. I looked like a terrified kitten. So I started slicking it down, and never stopped completely." He'd been less emphatic about it, recently.