According To Science, The Best Dads Have Smaller Balls

Swoon when you see dads wearing babies? ‘Aww’ when you see a daddy and daughter playing at the park? Heart melt when your hubby reads to your son? Us too.

But there’s a catch with these all-star daddies, because you know, there always is.

Science says the more involved a father is, the lower his testosterone and testes size. Meaning, your nurturing hubby has a lower sex drive.

A study published in the Proceedings of the National Academy of Sciences looked the parental involvement in fathers with toddlers. When comparing testes size, as scientists love to do, they found that highly involved dads had lower testosterone levels and smaller cojones than average men.

So, guys can’t have it all— be a kickass dad and have big balls? Trade-offs, people, trade-offs.

But is this really that much of a surprise that more involved parenting equals less sex? Prior studies have shown that when men become fathers, their testosterone levels drop more than childless men, but this is the first to show it’s affect on hands-on dads.

While I’m not married (nor am I or a father), I think it’s refreshing to see studies showing women aren’t the only ones biologically adapted to be parents. Plus, dads who spend a lot of time with their kids aren’t doing the same day-to-day activities as men without children—they have completely different lives. So, it makes sense their bodies change differently, too.

And, if this recent news seems discouraging for dads-to-be, remember this: DILFs are sexy, women love good hubbies and kids need good fathers. Oh, and you’re in good company with these guys, too.

This post originally appeared at YourTango.