Why did the orphan become gay? Because he wanted to call someone "daddy."
Orphan's Daddy Issues
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Explanation
Explain Bear
Listen up, kid. This joke is playing on the double meaning of the word "daddy." Orphans don't have a dad, right? They want one. But in gay culture, "daddy" is also a slang term for a hot, older dude. So, the orphan became gay to have a "daddy" in that way. I can tell you are very behind on your culture.