“Holding hands is a form of physical intimacy involving two or more people. It may or may not be sexual. Whether friends hold hands depends on culture and gender. The custom of men holding hands can cause discomfort in societies unused to it, as it did with Americans, when, in 2005, then Crown Prince Abdullah of Saudi Arabia held hands in public with then American president George W Bush.”
http://en.wikipedia.org/wiki/Holding_hands
“Holding hands is the warmest expression of affection between men,” said Samir Khalaf, a sociology professor at American University of Beirut in Lebanon. “It’s a sign of solidarity and kinship.”
In fact, if a man chooses not to touch another in a greeting, it can be interpreted as a sign of distance or disdain. Kissing cheeks, long handshakes and clutching hands are meant to reflect amity, devotion and most important, equality in status, noted Fuad Ishak Khuri, a social anthropologist.
“Arab culture has historically been segregated, so emotions and feelings are channeled to the same sex,” said Musa Shteiwi, a sociology professor at the University of Jordan. “Men spend a lot of time together, and these customs grew out of that.”
But as the Arab world changes, so do the customs. With growing urbanization and increased contact between the sexes, Professor Shteiwi noted, such gestures are slowly becoming dated. It’s rare to see men holding hands in a city like Beirut, where the sexes mingle openly, though it is still commonplace in Saudi Arabia and other countries where sex segregation remains strong.
http://www.nytimes.com/2005/05/01/weekinreview/01basics.html