It's true when they say that sex sells. Now, it's a growing trend in the tourism industry. This does not mean, that it's sex tourism, which is highly connected to prostitution, but it is libertine tourism where tourists engage in the "joyful pleasure of the body."

What's different is that this group of people celebrates sexuality that is free and not paid. They frequent establishments, like hotels, BnB, resorts, beaches, cruise lines or "camping trips," through travel agencies that specialize in these sectors.

In an article by Forbes, this raunchy, legal industry is fast becoming popular and can raise $20 billion in a year. Swingers, libertines, hedonists, and aficionados take part in foam parties, group sex, latex parties, exhibitionism and other sexual practices, will pay for the pleasure of having sexual adventures and tourist journeys around the world.

France has a large market for libertine tourism. Cap d'Agde in Southern France is called "Disneyland for adults," has recorded €100 million in tourism revenue for 2015. The French libertine travel agency Swingsy has a sex train that will have stops in famous European cities and where tourists can join lewd shows organized by clubs in partnership with the Swingsy. France has more than 400 swingers and libertines groups and clubs.

Other than that, the Azamara Quest by the Original Group will launch its first-ever Desire Cruise to sail along the Adriatic Sea on September 26 to October 3, 2017. The cruise will depart from Venice, Italy, Croatia and Slovenia. It will offer adult-themed parties and games with rates starting from $4000 for a Club Interior Stateroom to $10,996 for the Club World Owners Suite.

And it seemed like Italy is joining the scene, but not for raunchy purposes. According to the Daily Star, ten hotels are asking for couples to stay a night with them and have a romp. These hotels will even offer free accommodation to couples who conceived during their previous visit or have a refund.

While some countries are looking for fun, Italy is doing it for their birthrate. They are currently the lowest in the European Union.