Here's a humorous song about the incest taboo. I don't know who wrote it or where it's from.
JP

Johnny Be Fair

Oh Johnny be fair
and Johnny be fine
he wants me for to wed.
And I would marry Johnny
but my father up and said.
"I'm sad to tell you daughter
what your mother never knew.
That Johnny to is a son of mine
and so he's kin to you."

Oh Billy be fair
and Billy be fine. . .

Oh Jimmy be fair
and Jimmy be fine. . .

Well you never seen
a girl so sad and sorry as I was.
The boys in town are all my kin and
my father is the cause.
If life should thus continue
I shall die a single miss
so I go to my mother
and complain to her of this.

Oh daughter didn't I
teach you to forgive and to forget.
Your father might have
sowed his oats but
still you needn't fret.
Your father may be
father to all the boys
in town but still....
He's not the one who sired you
so marry who you will.

---

"Johnny Be Fair" was written by Buffy Sainte-Marie. She told us she wrote the song to to tell the story of a joke she heard. More at https://mudcat.org/@displaysong.cfm?SongID=3266 and the threads you'll find crosslinked there.
-Joe Offer, Mudcat Music Editor-