Dean Cain -- Yeah, I Took Brooke Shields' Virginity

Dean Cain says Brooke Shields is right on the money when she says she was deflowered by Superman and was so flummoxed by the experience she ran screaming down the hall naked.

Our photog got Dean at LAX Wednesday ... and asked about Brooke's new book in which she describes in great detail losing her virginity to him.

Dean's a gentleman and is cautious at first -- not having read the book -- but when our guy told him Brooke had good things to say, he was down with the whole story.

BTW ... our guy referred to it as her "experience" with Dean, and he made it clear ... they had a whole lot more than an experience.