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.
The dried, crustybullshit that stays on your dick and her pussy after sex. Prominent in middle eastern women, especially those with yak pussy.
Atiya and I were fucking real hard last night, and I woke up with this nasty sex humus all over my cock. Her yak pussy was so covered that it turned into a penis flytrap.