more (at source): But because we are programmed to avoid finding close relatives sexually attractive, this means those we trust are not necessarily the ones we find attractive. Dr DeBruine’s team found that even when looking at members of the opposite sex, subjects found those who looked like them trustworthy — but they did not want to sleep with them.

“When the players were judging the faces for physical attractiveness they thought similar faces less attractive,” she said. “So we believe resemblance is trustworthy — but not lustworthy.”