This is a classic topic on this sub with a long range of exquisitely flavored answers. Specifically:

Was oral sex an invention of modern western Europe?... with u/sunagainstgold and u/qed1 double teaming an answer on the Romans

EDIT: updated the link to point at the comment thread that discusses the Romans.

Is removing pubic hair a modern fad or did any historical cultures engage in the practice? has u/Celebreth, ahem, touching on this topic

Finally, u/Whoosier finishes us off with How was oral sex viewed by Ancient Romans?