When you touch boiling water, for example,get a cut, or even exercise too much, a special receptor on the neuron is activated, sending a signal to the brain - that hurts!.

VOA: standard.2010.05.04

The people who've run on the treadmill, even when that arousal is fairly obvious, you've got--you--doing a little bit of aerobic exercise, ? you still find the experimenter more attractive. Okay?

跑步的那个人，即使很明显，兴奋时因为做了一些有氧运动，你仍然发现实验者更具吸引力，对吧？

耶鲁公开课 - 心理学导论课程节选