What triggers that strange spark that makes a certain person strike us and not another? What makes us grow in the desire to know her better and be with her? A question of chemistry, but not only. Here's what studies and research say.

It is one of the most important decisions we make in our lives. Genetically we are predisposed to choose the best opportunities to propagate and transmit our genes, but often the decision is the result of a compromise. What do the scientific studies say?

What does it mean to feel good from a sexual point of view? A question of hormones, but also of physical health which must be monitored through prevention and early diagnoses. Does genital size matter? Science's answers to the most common questions about sex and health.

What is foreplay for? How long is the ideal duration of sexual intercourse? How does the male orgasm work? And the female one? Major scientific research debunks many circulating myths.

In the human species it takes a year to learn to walk, three years to talk, and even longer to get food. It is precisely for this reason, many scholars believe, that in the human species parents collaborate in parental care for the first years of their children's lives.

A pinch of jealousy, it is said, spices up the relationship. But, as with alcohol, beyond a certain dose it leads to out-of-control behavior. How does this human mechanism work? What explanations does science give? Is jealousy in the genes?

We have evidence that there have been betrayals since prehistoric times. Betrayal, moreover, exists in most animals, even those who seem perpetually faithful. But why do we cheat? Here's what studies and research say.

Studies say that falling in love lasts on average 2 or 3 years. And then? The disturbances of attraction are replaced by deeper feelings and the couple's relationship is consolidated. But what does it consist of? What makes a union solid?

In our country, fewer and fewer children are being had, resulting in an increase in the elderly population and a reduction in the active population. Why does the birth rate affect Italy more than other countries? How have other parts of the world managed to correct this phenomenon?