《男人来自火星，女人来自金星》一书探讨了两性世界的迥异生活。如果说金星上的爱神维纳斯讲美讲爱更讲情，那么火星上的战神马尔斯则重名重利更重自我。女生可能会说：男人的世界我不懂。是的，他们追求速度感，他们的相处模式不讲求花前月下，两心我相知；不在乎心心相印，感情多交流，而是更像电影《让子弹飞》所展现的凌厉和强势，电影《十月围城》所标榜的义气与忠诚那样：义气相投，兄友弟恭，肝胆相照。其实，很多时候，男人之间的相处模式是带有那么点“匪气”的，给人不务正业，蛇鼠一窝的感觉，所以才会衍生出酒桌上的“舍命陪君子”一说，而这却会换来哥儿们感情上质的飞跃。

是的，有那么点肤浅，有那么点粗鄙，也有那么点胡闹，不过，在他们的世界里，那叫“男人间的友情”。

On and Off Screen, Bromance Sells

Laurel and Hardy never discussed their feelings. Martin and Lewis didn't worry about having enough male friends. Lemmon and Matthau were more interested in bickering than hugging.

That is how men dealt with their relationship with their best friend in the past—they goofed around with each other, made audiences laugh, but never discussed the deeper meaning of their friendships. By contrast, today's men are more enlightened when it comes to their relationships with one another. They confide their worrie they act vulnerable, they hug. The word "bromance" reportedly dates back to the early 1990 when it appeared in Big Brother, to describe the relationship between skateboarders who spent lots of time together. Brother plus romance equals bromance. But does the true male friendship exist in Hollywood? The Tinseltown where huge numbers of people are trying to overshadow others to get to the top and dirty secrets are everywhere?

They are competitors ultimately but on screen bromance can be a ticket to big box-office revenues. Director Judd Apatow has based his career on the concept. His movies feature man-boys who often learn about themselves by bonding with other men. One of the last scenes in the movie Superbad features Jonah Hill and Michael Cera cuddling. Ben Stiller and Owen Wilson's eight films together have earned a total of $1.8 billion at the box office. Next come George Clooney and Brad Pitt. The four movies they have appeared in together earned a total of $1.3 billion at the box office, with the Ocean's trilogy accounting for most of that money. Don't forget Kevin Smith and Jason Mewes. They team up together more often than not, and their films have earned $109 million.

You might think, "Well without all their movie-star power, those star amigos wouldn't have anything in common with each other." But let's dial back a little bit and see the bright side of the Hollywood off-screen life. Audiences love seeing George Clooney and Brad Pitt in the Ocean's movie not just because of their good looks but because they know the two men are close friends in real life.

And what about that other couple of superstar bro Tom Cruise and Will Smith! These two megastars have become fast friends in the A-list community and frequently hit the red carpet together. Tom and Will are often spotted wining and dining with wives Katie Holmes and Jada Pinkett Smith and having play dates with their children. Will famously defended Tom's beliefs in a 2008 interview with accesshollywood.com saying that Tom "is one of the greatest spirits I've ever met." The two are so close that Tom's oldest son, Conner, played a young Will Smith in his film Seven Pounds. These two bros are bound to go the distance!

Leonardo DiCaprio and Tobey Maguire met while auditioning for the TV series Parenthood. They were young and went on to become best friend helping each other score roles in other TV shows and movies like This Boys Life. Leo is a pretty good guy and is a fearless crusader for a more environmentally aware planet, while Tobey seems super sweet and down to earth. Now they are often seen paired up for Lakers' basketball games.

And speaking of friends since childhood, we must mention Matt Damon and Ben Affleck who were the Tinseltown dynamic duo of the late '90s. Childhood friends hailing from Cambridge, MA, they came independently to Hollywood to seek fame and fortune. When that wasn't forthcoming, they wrote and starred in Good Will Hunting, which won a Best Screenplay Oscar for the pair. And overnight, they became household names. With the two having never veered from their shared Boston upbringing, Affleck observe "I think it would be the same for anybody. You're friends when you are young, you have a certain life. Then in your 20s you have a different life. In your 30s you get married and have families. It's a different kind of satisfaction being around your friend the friends you grew up with. They have kid have barbecues and that kind of deal. That is really satisfying, too. It's one of the nice things about having friends for a long time," says Affleck.

When it comes to re-team for professional project Affleck and Damon haven't been paired together on screen for quite some time. Affleck says the timing now feels right to re-team once again. "If we work together it's an excuse to hang out."