Can Men & Women be "Just Friends"?  

A lot of people say it's not possible to just be friends with the opposite sex but I tend to think that's an old fashioned way of thinking and comes from the days where men worked, women kept house and usually the two only crossed paths in order to "hook up"  

While I don't think it's impossible to be just friends, I do think it's virtually impossible to not have at least one sexually arousing thought towards that friend, even if we're not the first to put our hands up and admit it.  

Do men and women sometimes treat each other as the enemy in order not to get too close?  

Sometimes even the longest running friendships can feel like an isolated one way street if you happen to find yourself a partner and your friend is still single, is it because they're no longer in the running for your affections?  

I was browsing through some survey statistics and discovered that 83% of women do think being "just friends" is possible but 45% of those women are already friends with ex-lovers. - Obviously a boundary had to of been crossed there at some point....  Maybe it's easier to maintain a friendship after the relationship happens?  

I'm really interested to hear your thoughts or experiences.