There's a biological reason why humans are hornier during the summer (and it has nothing to do with a dramatic seasonal increase in tank tops). Here goes: We all have a third eye called the pineal gland located in the middle of the brain, which secretes melatonin. That's what helps us sleep. Melatonin blocks our sex hormones, and the long and bright days of sunshine cause a decrease in melatonin production (which is what stimulates breeding in some animals, and vice versa when days are shorter and nights are longer). So our pineal gland senses the length of the day and increases our sexual drive in relation to it. What's the upside? The child is born in the following spring and has the summer to grow before enduring the challenges of winter.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.