9. A Strong Immune System
If you have a strong immune system, it may be a sign that you have other qualities women want. According to a study published in the journal Nature Communications, a strong immune system is a sign of high levels of testosterone as well as certain stress hormones, which tend to give men more masculine facial features (something that most women usually look for in their mates). The study suggests that the combination of strong immune system and strong facial features may be key to how hormones attract women.
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