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1. Falling In Love Has Opposing Chemical Effects On Men And Women

While falling head over heels seems to cause a man’s T-levels to dip, love seems to have the opposite effect on women. Italian researchers found that a women’s levels of testosterone rises while the man’s levels drop, so the two partners become more like each other. “Men, in some way, had become more like women, and women had become like men,” says lead researcher Donatella Marazziti from the University of Pisa. “It’s as if nature wants to eliminate what can be different in men and women, because it’s more important to survive [and mate] at this stage.” her team concluded that converging levels of testosterone bring lovers together.

2. Losing It Helps Him Become More Of A Family Man.

This fact is actually kind of endearing. In a study, published in Proceedings Of The National Academy Of Sciences, researchers recruited 70 biological fathers of toddlers. Using blood tests, MRI scans of the testes, and feedback from the mothers, they found that “men with lower testosterone levels, were more involved in the day-to-day caregiving of the child,” according to associate professor and co-author of the study, James Rilling. The lowered testosterone allows the man to be more sensitive to his child’s needs, bond with it and stay loyal to his mate. These results also attest to an evolutionary theory called the “Life History Theory” that suggests that organisms have a finite amount of energy to invest in either mating and parenting strategies.