I've had friends tell me that there are websites out there that you can use to register for your honeymoon and your guests just log on and contribute to your trip. Is that ok to do? Is that really greedy or tacky? I'm not sure we can afford a honeymoon otherwise and I think it's more tacky to ask for a "green back" wedding. We have been living together for 6 years and we've got all the household items a couple would normally register for. help?