Male college students had higher heat pain thresholds when an attractive woman was delivering the stimulus.

“So one experiment, this wasn't intended, at least I don't believe so, they were measuring heat thresholds on college students. And we experiment a lot on students, as we all know. We pay them well. And what they found is that when they're studying guys, studying dudes, when there was an attractive woman who was delivering the stimulus, the thresholds were higher. Because the guys did not want to look like a wuss in front of this attractive young woman. And that's been pretty well established.”