I dont think ive ever used a coupon anywhere. Maybe a gift card, but a coupon? Im not an 80 year old woman. If I did, there is NO WAY i would use it on a first, second, or third date for that matter. I look at it the same way as when people come in and run up a huge bill and try and save money by not tipping. If you cant afford to go there, pay full price, and tip, then you shouldnt be going there anyway.
Im sure there is a Chili's, Applebees or something along those lines that do that 2 people can eat for $20 thing somewhere in your town you can take her to. Makes you look less cheap, and you get out for half the price. But you also have to take your first date to Chili's; and unless this is your Junior Prom you should have just used a coupon at a nicer place, because chicken crispers dont equal poon-tang where im from..