Here's a quite specific answer from Philip Larkin:

  Sexual intercourse began
  In nineteen sixty-three
  (which was rather late for me) -
  Between the end of the Chatterley ban
  And the Beatles' first LP.

(from https://allpoetry.com/Annus-Mirabilis)

It doesn't answer the fun part, though, because Larkin was known to have a tedious love life.