This is an expression used to describe an activity or action that enhances one's awareness of different cultural practices. This can be trying different foods, bungee jumping, traveling etc.
"Let's go watch the sunrise tomorrow."
"Why the fuck would we do that?!"
Come on, you obviously need a little cultural enrichment!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi