In the 1950s and 60s, Masters and Johnson studied sexual function in 700 people who agreed to have their sex or self-pleasure watched under close scientific scrutiny.
The researchers measured bodily responses and studied the vagina during orgasm by placing a camera in a clear plastic penis.
One important contribution was defining the four-stage model of sexual response, which they described as the human sexual response cycle defined as:
I believe it was the media frenzy surrounding the Tiger Woods’ scandal that made sex addiction ‘real’ to people. Ironically the poster boy for sex addiction, Tiger Woods, doesn’t have a sex addiction: massive ego and poor judgment certainly; a sex addiction, certainly not.
Ask anyone to name a sex book and The Kama Sutra will inevitably be in their top five. The irony of the original Kama Sutra is if you've read it cover to cover, which I have, it's an incredibly dull and tedious book.
I believe it was the media frenzy surrounding the 
