I think it really depends on how you educate your kids... if they are in an environment that is open minded, then I did just started introducing themes... such as giving situations where I can make comparisons with other friends and pointing beneficial positives and good highlights... kind of preparing the scene for the mindset.

Then either make it clear or just make him/she guess (with too many clues and in a fun way). Either way, kids adapt pretty quickly to almost all situations.