NEW YORK — People RSVP-ing to weddings this summer should not be surprised if they're asked how they want to pay: check or charge?

Engaged couples are tossing traditional registries faster than bouquets, asking for cash instead of Cuisinarts. Some lovebirds set up money registries, looking for "donations" to help defray the costs of the wedding or a mortgage, while others seek cash for honeymoon expenses.

Nader Khoury and his fiancée are pioneers in the money-for-marriage movement. The couple put a down payment on a house with all the money they collected from guests they directed to a personal Web site set up for that purpose in August 2002.

"We got $10,000," says Khoury, "but it was a new concept then. Now it's a trend and there's less of a stigma to it."

He should know. Inspired by their own success, Khoury and his bride launched www.aperfectweddinggift.com, an online mon-

ey registry based in California.

"It's typical American philosophy to think it's crass to ask for money, and a lot of people still feel that way," says Khoury, "but in Asian countries and in the Middle East that's what you do."

Sue Fox, author of "Etiquette for Dummies," agrees. "Other cultures give money and it's not a big deal. I think we have to lighten up. Etiquette changes with the times."

Clearly, shelling out for a big old shebang is catching on. The number of couples registered at Khoury's site has quadrupled in just two years, from 254 registries in 2003 to about 1,000 for this year. The honeymoon registry www.thebigday.com debuted in 2001. They had just a few dozen clients that first year but have recently added a travel-agency service. "We've had tremendous growth," says Jeff Beard, director of business development. "We have over 12,000 clients in 86 countries now. It's becoming a 21st-century tradition."

With the price of the average New York wedding now a whopping $38,000, industry watchers say it's no surprise some couples are asking for dollars instead of dinnerware.

But while many Americans are comfortable contributing to a honeymoon registry, which allows them to "give" the newlyweds an activity like scuba lessons, the and so-called money registries, where guests help pick up the tab for the wedding itself, leaves a bad taste.

Valerie Lehman, who got married a year ago, felt awkward about wanting ka-ching instead of kitchen knives.

"It was my third marriage, I owned enough stuff," says Lehman, who married Michael Washington last year. "I didn't feel comfortable saying, 'Give us money,' so we set up a Web site to fund our honeymoon. I asked for money for spa activities and to swim with the dolphins."

Like Khoury, her experience inspired her to launch www.registrypalace.com, which helps engaged couples solicit honeymoon help.

Letitia Baldrige, author of "New Manners for New Times: A complete guide to Etiquette" and former social secretary for Jackie O, says, "This is the crassest thing I've seen in all my years of social observances. ... It's horribly wrong."

But brides like Lehman are laughing all the way to the bank. "My honeymoon was fabulous," says Lehman, "and it was free!"