All in the Family: Nudity

Nudity of close kin seems to be something that people are uncomfortable about, as Sigmund Freud intimated in his concept of the Primal Scene.  Okay, Herr Freud was not simply referring to one's parents being merely naked, but nekkid and up to something, as Lewis Grizzard once put it.

I'm sure that most of us would be horrified if we discovered nude pictures of our grandmothers; or pictures of her wearing substantial décollété*, or a swimsuit that is too revealing according to contemporary standards (obviously, not in present-day circumstances!).  And, many of us would conveniently find a way to, uh, lose those incriminative photos.  In a New York minute!

But what about pictures of one's great-grandmother?  Or great-great-grandmother?  Or, let's be equal about this:  Suppose you found a picture of your grandfather nude, with his junk in all its glory; would you be upset?  How much?

Would you be less upset if it was a more remote ancestor?  How many great- or great-great- prefixes is needed before you are comfortable?

Specifically, does it work like this:

Nude picture of:                      Discomfort level:
Parent                                     Astronomical!
Grandparent                            High
Great-grandparent                   Moderate
Great-great-grandparent          Lower
5X Great-grandparent              None
Adam and Eve                          None

I'm just suggesting an idea:  people are more uncomfortable about this hypothetical nudity if it involves someone they directly know, rather than some distant ancestor who is also a stranger.

Look at it this way:  Adam and Eve are almost always depicted nude.  Yeah, it's the innocence metaphor; but if we go with the Adam and Eve story about being our species' original parents, we're pretty comfortable with how they are depicted.  Michaelangelo even depicted Adam's little soldier on the ceiling of the Sistine Chapel!

*I have something specific in mind.