David Boreanaz and Nathan Fillion have both been small-screen staples for decades, and they bare a striking resemblance to one another that actually allows them to star in each other's shows! Hollywood trivia: The two pranksters switched roles halfway between their shows Bones and Castle. You heard it here.

What we're really loving is that David - who is most famous for starring on Buffy, Angel, and Bones and Nathan - who starred on Castle and more recently The Rookie - have both stripped down on screen. And they both have gorgeous manly bodies that you just want to rub your hands all over. Nathan gave up his insanely plump ass on Firefly and Outing Riley, while David briefly went crack-out on Buffy the Vampire Slayer, but went majorly nude and even flashed his penis in These Girls!

We want to know which guy you think is hotter, so make sure tovote using the Twitter poll above! This is your time to be heard!

David Boreanaz

Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?

Nathan Fillion

Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?Who'd You Rather Blow: David Boreanaz or Nathan Fillion?