That quote is from the Duke, John Wayne.Some other notable quotes about sex.

Some things are better than sex, some things are worse, but there's nothing exactly like it.
-W. C. Fields

Sex is dirty only if it's done right.
-Woody Allen

Great sex is great but bad sex is like a peanut butter and jelly sandwich
-Billy Idol

My take from these quotes: Healthy,lusty,great sex is wonderful
when done right and there's nothing else exactly like it except sometimes when you satisfy your craving for a white castle hamburger
(I don't care for peanut butter...lol)

Cheers!

"From the moment I was six I felt sexy. And let me tell you it was hell, sheer hell, waiting to do something about it."
-Bette Davis
"Graze on my lips; and if those hills be dry, stray lower, where the pleasant fountains lie."
-William Shakespeare
"Sex is like a bridge game; if you don't have a good partner, you better have a good hand."
"If God had intended us not to masturbate, He would have made our arms shorter."
-George Carlin

From the moment I was six, I felt sexy, and let me tell you it was hell, sheer hell, waiting to do something about it. So, while I waited, I masturbated, after all, if God had not intended for us to masturbate, he would have made us with shorter arms. And, if you don't have a good partner, you better have a good hand. Alas, he arrived, and grazed upon my lips, knowing that if he found those hills be dry, he could stray lower where the pleasant fountains lie...

(thanks, VR. Enjoyed that!)

A few of my favorites

“I like my sex the way I play basketball, one on one with as little dribbling as possible."
-Leslie Nielsen

There are a number of mechanical devices which increase sexual arousal, particularly in women. Chief among these is the Mercedes-Benz 380SL convertible."
- P. J. O Rourke

"I believe that sex is one of the most beautiful, natural, wholesomethings that money can buy."
- Steve Martin

I used to be Snow White -- but I drifted.
- Mae West

When choosing between evils, I always like to take the one I've never tried before.
- Mae West

"Sex is just about the most fun you can have without laughing."
-Woody Allen

"See, the problem is that God gives men a brain and a penis, and only enough blood to run one at a time."
-Robin Williams

and tremendous consolidation on them phrases, Sedona.

"The angle of the dangle is equally proportional to the heat of the meat provided that the urge to surge remains constant."

I don't know who said that... maybe Sir Isaac Newton...lol
but it works for me ...

Cheers!

...Sex is No. 1"  Brigette Bardot

"Personally, I know nothing about sex because I've always been married."  Zsa Zsa Gabor

"I'd rather hit than have sex" Reggie Jackson

"Sex is hardly ever just about sex."  Shirley Maclaine

"Never miss a chance to have sex or be on television."  Gore Vidal

and finally...
"The only unnatural sexual act is that which you cannot perform." Alfred Kinsey