Yes. There was a scene in the car where Ashton Kutcher and Sean William Scott kissed.
An excerpt from blogs.dailynews.com says:
These two guys, playing girl crazy slackers, unexpectedly give moviegoers one of the best on-screen kisses between two men ever. They end up at a red light next to Fabio and his hot girlfriend and begin a game of one-upmanship. Fabio revves his car, Kutcher revves their car. Fabio puts his arm around the girl, Kutcher puts his arm around Scott. Fabio makes out with the girl, Kutcher makes out with Scott!
That was not Kutcher's last onscreen kiss with a male co-star. His second was with John Cryer.
Cryer and Kutcher was a guest on Conan and they talked about kissing male co-stars.
Of interest, check out the 10 Greatest Guy On Guy Kisses In Movie History, featured at WhatCulture.com