“This is such a high-traveling, high-spending population,” said Andrew Flack, vice president for product marketing and customer insights of Hilton Worldwide, adding that in the United States a higher percentage of L.G.B.T. travelers have passports than the general travel population.

One boost to gay tourism, travel industry experts say, is same-sex marriage. In New York City alone, the economic impact of the first year of gay marriage was $259.5 million plus $16.5 million in local tax and fee revenues, according to NYC & Company, the city’s marketing and tourism organization.

And the marriage and honeymoon business is still in its infancy. A 2013 study from Community Marketing found that most couples who married had their wedding receptions at restaurants and private residences. Nonetheless, hotels are preparing for an influx of same-sex ceremonies. Last year W Retreat & Spa-Vieques Island partnered with one of the first businesses in the United States to specialize in planning legal same-sex weddings. And this year, despite Florida’s same-sex marriage ban, the Westin Diplomat Resort & Spa in Hollywood, Fla., struck the words “bride and groom” from its wedding marketing materials and has two same-sex wedding planners at the ready.

As for honeymoons, only about 57 percent of same-sex couples went on one after their ceremony (65 percent of them were women) last year, according to Community Marketing. David Paisley, the company’s senior research director, said the reason for that might be that when a state allows same-sex marriage, couples rush to legally tie the knot yet delay the honeymoon because they haven’t found time to plan it or have already made all their travel plans for the year. Time will tell. Among those who did take a honeymoon, there was no far and away favorite destination, although Hawaii was at the top of the list with 7 percent of couples opting to celebrate there.

Families are another fast-growing segment. More than a decade ago, when a company called R Family Vacations began specializing in cruises for L.G.B.T. families and friends, it was in the vanguard.

“There has really been a huge change,” said Don Tuthill, the publisher of Passport magazine. “When they did that they were the only one. Now everyone is reaching out for that market.” Although Community Marketing’s research shows that when gay couples have children, finding a child-friendly hotel becomes more important than an L.G.B.T.-friendly hotel.