What did Ashton Kutcher learn from kissing two men onscreen?

A kiss isn't just a kiss for Ashton Kutcher. With the right person, it can be an enlightening experience.

Ashton and his former Two and a Half Men co-star John Cryer told Conan O'Brien what it was like to pash on the sitcom. Watch the video above to find out what he learned from the pash.

For those who didn't watch the show, their straight characters got hitched in the final season and ended up engaging in some of the physical perks of marriage.

Kind of makes us want to check out some of those final-season episodes.

But we're still wondering who's the better kisser: Jon or Ashton's Dude, Where's My Car co-star/pash partner Seann William Scott?