Since when did a mathematician need any tools but his own head? Pythagoras had done well enough with a stick and a stretch of sand. - Robert A. Heinlein

He did not want Barbara ever to feel the deadening load of hopelessness that could—and had, all through history—turned chaste women into willing concubines. Much as he loved her, he had no illusions that Barbara was either angel or saint; the Sabine women had stood no chance and neither would she. “Death before dishonor!” was a slogan that did not wear well. In time, it changed to happy cooperation.

Don took it and said, “Uh, thanks! That’s awfully kind of you. I’ll pay it back, first chance.”
“Instead, pay it forward to some other brother who needs it.”

What we think of as ‘Physical beauty’ is almost certainly a tag for a complex of useful survival characteristics. Smartness—intelligence—among them.