Why can't orphans be gay?
They have no one to call "daddy/mommy."
Orphan's Parents
Explanation
Explain Bear
Alright listen up, buttercup. This joke plays on the double meaning of "daddy/mommy." On one hand, it's a parental figure. On the other hand, it's slang used in the LGBTQ+ community for a hot person who's often older. Since orphans don't have parents, they have no "daddy/mommy."