A study published last fall by the Proceedings of the National Academy of Sciences discovered that men experience a drop in testosterone levels when they become first-time fathers.
Michael Simmons admits that he’s experienced the study results first-hand since the births of his 3-year-old daughter Halle and 18-month-old son Jayden.
"I'll be driving somewhere and feeling like I have more responsibility. … I wasn't a very risky person at all, but now I have that voice in my head," Simmons confessed.
This study is one of the first to research the impact of parenthood on adults rather than the child.