Things You Didn’t Want To Know….

Speaking of Nightline, Ted Koppel’s prom date offers Page Six some PG-13 rated details of their evening oh-so-many-years-ago.

Busty actress Sally Kirkland tattles that curiously-coiffed “Nightline” anchor Ted Koppel was the first man to lay a hand on her ample bosom.

Kirkland, 60, says Koppel made his move when he was a 17-year-old senior at Manhattan’s McBurney HS and she was 14-year-old freshman at Nightingale, when they were riding in the back of a horse-drawn carriage after his prom.

“Ted had those huge ears, which stuck out so much and everyone called him ‘Dumbo,’ ” Kirkland recalled to Webster Hall curator Baird Jones.

“He certainly was not a looker. But I didn’t care because he was so smart . . . I had made up my mind that I would let him do what he wanted with my body, which for a ninth-grader meant going to second base. I wanted the experience of being a full woman.

“But I only let Ted touch my breast on the outside of my prom dress. Fortunately the buggy driver was discreet and did not look back. I had pecked other girls at all-night parties, but this was the first time I had let someone else’s tongue in my mouth.

As we said, WAAAAAYYYYY too much detail.

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