Technically Doug and Patti DID kiss once
Jim Jinkins claims that the question he was asked most about "Doug" was "When will Doug Kiss Patti?" and he said "It's a Secret!" but technically they did kiss once. In the episode "Doug Throws a Party" Patti plants a kiss on Doug's cheek. Of course it's not a romantic kiss and it wasn't as if they were kissing each other but I think you can still count it.
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