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4.
A cheap (probably free) and meaningless gift that is meant to be an expression of love for your girlfriend, given with the sole intention of persuading her to have sex.
A typical sex coupon would be food or drink presented as heart shapes: cake, buttered bread, froth on a Cappuccino.

Another sex coupon would be something like a heart shaped key ring you got free with some expensive stuff you bought for yourself.
by scotcher February 04, 2012
 
1.
When drinking beer out of a bottle, one might try to peel off the label. People who have tried it, or seen others try, know how hard it is. Supposedly, once you have the label completly off and perfectly inatct, you are able to redeem this label for sex with a person of the opposite sex.
Woah! Chris just got himself a sex coupon, I wonder if Jessica has a double coupon day so I can get some action too.
by Joe May 18, 2005
 
2.
That book your girlfriend makes you with sex coupons that when you try to use them all they she tells you to fuck off.
Me-"Yeah, can I use that sex coupon for one free BJ right now" GF-"Nope, fuck off asshole"
by racer76916 November 26, 2009
 
3.
Coupons you give to your significant other for sexual favors. The coupons are normally non transferable and may be good for "1 Blow job", "1 night of sex", etc. Sex coupons are normally gifted on Birthdays and Christmas. These coupons are rarely honored, unless the issuing party is "in the mood", and the expiration date is basically whenever the issuer deems it to be. Sex coupons are normally given when money is tight, and there is an obligation to give some sort of gift for an occasion.

Also referred to as "Ass Rations"
All my wife gave me for Christmas was a book of Sex coupons."
by Dodgamatic September 17, 2014