PS I found the source:
from The Multi-Orgasmic Couple by Mantak and Maneewan Chia and Douglas and Rachel Carlton Abrams M.D.

"When you breathe slowly and deeply, your heart rate decreases, as we discussed above, increased heart rate is one part of orgasm, and breathing quickly signals its approach."

The book was highly recommended to my wife by one of her lovers and it was of great help in that circumstance, but I never finished the rest of the exercises. I must be 6 kinds of dumb.

Anyway you can get the book through Amazon.com. Best of luck.

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