The first ‘adult’ book I read was ‘The Story of O.’ I was fourteen, and I bought it in an airport news shop before a trans-Atlantic flight. I was flying with my older brother, who ignored me as much as possible. This make it possible for me to devour 'The Story of O' from cover to cover.
‘The Story of O’ is about a young woman willing to prove her love for a man by being his sex slave. He trains her to be the sex toy for his discreet men’s club. She is always blindfolded, but is sure she knows when he engages her.
It is acceptable erotica in today’s doors-wide-open world, but back in the ‘60’s, it was billed as taboo.
I learned a lot that flight.