People often see a large jawbone as a masculine feature, per the wonderfully named “Facial Attractiveness: Evolutionary Based Research,” a review piece published in 2011. The authors note that secondary sex characteristics (such as defined cheekbones and large jawbones) may show genetic strength.Why? Well, one theory is parasitic resistance. Stay with us: Hormones like testosterone drive the development of secondary sex characteristics, and since those hormones also promote a healthy immune system, strong jawbones can show your potential mate that you’re fairly resistant to parasites. That’s also a great bit of info to drop to make a decent first impression (or maybe save the parasite talk for the second date).
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