what a question..of course,there are no right or wrong answer to this particular question..however,I will try to provide my views from both sides..
Man and Woman can be just "friends"
-let say if hosni and lisa are just friends,it might be that they found each other unattractive..in other words,hosni is not attracted to lisa at all and lisa too..therefore, they're able to suppress their 'loveness'(is there such word?) from growing..it might be a cruel fact,but that's the truth(might be)..
Man and Woman can't be just "friends"
-most of us will agree with this one..definitely..i've heard people saying that 'ahhh,there're no ways that it could happen..it's just tooooo illogical'..i think it's like a chain reaction effect..break the ice,be friends, and then u noe wut..
well,wutever it is,I think that it's possible both ways..but one thing for sure,it's really hard if a friend is in love with his or her friend..i noe this for sure because i hav a friend who used to love his girl bestfriend in secret..n seeing him,i could clearly see the suffering that he had to endure all these years..when i talked to him,he simply said,'no worries,as long as i could make her happy,that's the only thing that matters'..now that's what u called 'unconditional love'..