a typical sex coupon would be food or drink presented as heart shapes: cake, buttered bread, froth on a cappuccino
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" What is the definition of "sex coupon"?