The Talmud reads like grafitti by 14 year-olds.

The Bar-Mitzvah ceremony is a rite of
passage in the Jewish religion, where
a boy becomes a man in the community at
the age of 13, the age of Bar-Mitzvah.

Much of the scandalous passages in the
Babylonian Talmud (and probably some of
the other Talmuds) read like they were
written by juveniles, with the insider
jokes, scatalogical (fixation on shit),
all kinds of perversions, and plain old
tall tales. This is the way Junior-high
and middle school kids write. Then they
grow up and usually grow out of it.

There was a lot of peer-bonding in the
schools that wrote the Talmuds, and the
pupils there, being legal adults at 13,
must have had a heap of fun putting the
junk they wrote into the Talmud, and
seeing their works in print.

Then, there was the rivalry factor, and
some of them probably blackmailed other
classmates into leaving it in the book.

Rather than a conspiracy back in the
100s BC, I think it was a lack of adult
supervision.