Here’s the skinny on Americans — they love to swim nude when on vacations, according to a new survey by an online dating Web site.

According to more than 15,000 respondents, skinny-dipping is very popular among singles — but being caught in the act (of swimming with no clothes on), not so much.

The survey by MissTravel.com showed more than 70 percent of travelers have gone skinny-dipping, while 38 percent have been caught while doing so.

Among recent celebrities, Cameron Diaz, Kate Upton and Rihanna have all been photographed skinny dipping in exotic locales.

MIT alum Brandon Wade started the Web site with $2,000 of his own money in 2012.

Wade — who splits time between Manhattan and Las Vegas — says the site made $2 million in revenues, with 150,000 members, at the end of the first year. It is now in 135 countries, with more than 600,000 members worldwide, including 18,097 members in New York.

A one-month membership costs $39.99.

MissTravel is open to all ages, but most members are ages 18 to 34.

The site differs from others in that singles can venture on first dates at vacation destinations all over the world in hopes of finding romance.

Wade says he is not seeing hotels or companies being open to offering skinny-dipping packages just yet, but it is clear America is becoming more comfortable with nudity.

New York hotels could cash in on the trend, following the lead of resorts in Las Vegas and Miami, which have topless pool decks.