LOL - I'd sure have their attention after the opening...

"At Esalen there are some large baths fed by hot springs situated on a ledge about thirty feet above the ocean. One of my most pleasurable experiences has been to sit in one of those baths and watch the waves crashing onto the rocky shore below, to gaze into the clear blue sky above, and to study a beautiful nude as she quietly appears and settles into the bath with me.

One time I sat down in a bath where there was a beautiful girl sitting with a guy who didn't seem to know her. Right away I began thinking, "Gee! How am I gonna get started talking to this beautiful nude babe?"

I'm trying to figure out what to say, when the guy says to her, I'm, uh, studying massage. Could I practice on you?"

"Sure," she says. They get out of the bath and she lies down on a massage table nearby."

Good general idea, though - I like the Feynman angle - just have to find some of his stuff with minimal sex references...

Actually, I found the version in "The Pleasure of Finding Things Out" which does not have quite the same lascivious language and tone as the version I found online. This should work...

Seconding the cargo cult science speech.