The problem with all of us, these days, is that we're way too self-aware of all the perversion and filth that can happen in the human mind. I actually don't think Passion Patties was strictly made to cater to someone's weight gain fetish. I think the writers and animators genuinely just did it because they wanted to make a joke about Clover and her worries about her head size.
But if it were made THESE days, it WOULD be deliberately made to trigger fat fetishes. We've lost our innocence as a society and can never regain it.
