I'm curious about how you define those terms, either to compare experiences or see where our differences in semantics lie. I did have to note that "drunken sex orgy" is somehow my description of "fun" when I verbalize, but I'm not nearly that narrowly focussed.

Filing an awesome motion is fun.
Squatting 275 lbs for the first time is fun.
Watching dumb tv with my squeeze is fun.
Reviewing my retirement accounts is fun.
Still - family? Not fun. For me the family standard is "Didn't suck"