Some athletes are all business when it comes to their particular sport, and they don't care to split their time between sports and modeling. Which is totally fine, but not as much fun for the general public.
Then there are others who don't mind taking it off on occasion. Whether it's just to make ends meet and pay the bills or narcissism and vanity run amok, it's always a treat for the public when an athlete makes a foray into the world of underwear modeling.
Let's take a look at 20 athletes who have made that foray.
Vicki Hawkins is a member of the British Olympic women's water polo team and one of several female athletes from the country that participated in a lingerie calendar shoot in advance of the London Olympics.
Argentinian tennis pro Gisela Dulko has had a tennis career much like Russian beauty Anna Kournikova's—a very disappointing singles career, but moderate success playing doubles.
Unlike Kournikova though, Dulko has done more modeling on the side and she recently tweeted this photo from an underwear modeling shoot for a company called Selu.
It's fair to say that Real Madrid superstar Cristiano Ronaldo loves him some him, which is why he probably didn't think twice about stripping down for this Emporio Armani campaign. And why should he? Dude looks good.
German Olympic speedster Anni Friesinger is one of the most successful and well-known female athletes in her country. Not only has she brought home countless medals in international competition, she also hasn't been shy about baring it all (or most of it) for various publications.
Liz Gorman is a veteran of the Lingerie Football League who has played for the Tampa Bay Breeze. When she's not playing football in her lingerie, she's often modeling in it—Gorman is a successful fitness model outside the game.
English synchronized swimmer Jenna Randal is another athlete who participated in the lingerie calendar in late 2011. She is one of 12 Olympic hopefuls to do so. The proceeds from the calendar will go to charity.
MMA superstar turned legit movie star Gina Carano has been one of the most popular figures in MMA for years. Probably because she can take care of business in the ring, and often looks like that out of the ring.
Carano has modeled in various states of undress for magazines such as Maxim and, more recently, GQ.
Tanyka Renee plays in the Lingerie Football League for the Philadelphia Passion. Away from football, Renee has forged a successful career as a fashion model who has appeared in a number of publications, including Playboy.
Tennis superstar Rafael Nadal is the most recent athlete to strip down to his Emporio Armani underwear.
Francesca Snell joined two of her women's water polo teammates on Britain's national team in posing for the lingerie calendar of Olympic hopefuls in late 2011.
Rachel Leah has been one of the better-known women in MMA over the last several years. Unsurprisingly, she finds plenty of modeling work outside of the ring.
Like her teammate Tanyka Renee, Kate Osman also plays for the Lingerie Football League's Philadelphia Passion and does the modeling thing to pay the bills.
The most high-profile backup quarterback in the history of the world, Tim Tebow isn't the only New York Jets quarterback who looks good without his shirt.
Tebow has an endorsement deal with Jockey and hasn't been shy about taking his shirt off for the company. And the ladies thank him for that.
Who knew flatware racing canoeing was a sport, let alone an Olympic sport? Obviously, England's Jess Walker did and she is the final Brit donning lingerie for charity to make this list.
After appearing in lingerie in FHM, skier Kristie Leskinen became one of the most popular female athletes nobody has ever seen perform. Leskinen hasn't had much measured success in skiing but remains one of the most popular female athletes on the Internet.
Brazilian beauties Bia and Branca Feres are straight out of central casting for every man's fantasy. These synchronized swimming twins definitely aren't shy about stripping down and getting a bit closer than most of us would prefer to get with our own siblings.
David and Victoria Beckham were two of the first sports stars to bare most of it for Emporio Armani. The couple has appeared in a number of advertisements for the company—both together and individually—and remain two of their most popular celebrity spokespeople.
It's actually hard to picture former WWE Diva Stacy Keibler in anything more than underwear, as she's rarely wearing much more.
As a Diva, a cast member of ABC's Dancing with the Stars and as a men's magazine staple, Keibler obviously knows she's got the goods and isn't afraid to show them off.
Paraguayan Olympic athlete Leryn Franco splits her time between training for the 2012 Olympics in London and modeling. She's a former beauty queen and one of the most successful models in South America.