it is very = it is a very difficult subject.
men/men friendships differ from women/men or women/women friendships.
first of all i want to talk about men/men friendships and women/men's.
most of men/men friendships is = are made in teen-age. they have different back-ground and different life goal. but they spent time together for a long time and know each other well.
sometime they have a argument and fight. = They sometimes argue and fight, but women and men are different. it is difficult women and men like same game and how understand for same things is different. = It is difficult for men and women to have same interest and how men and women understand things is different. 
i have women friends who graduate same school. = I have women friends who graduated from the same school  but, after their wedding i feel a little bit uncomfortable and i don't contact  them occasionally, even I am not very conservative.
second, about women/women friendships. actually i don't know about women/women friendships but i can see my wife and her friend's friendship . their friendship is similar with men's.
difference is women depend on wedding and family. after wedding women doesn't have enough time to spend own her time. = don't have enough time for themselves sometimes they jealousy each other = they are sometimes jelous of each other I = I'm sure men also envy their friends.
but women's jealousy is a little bit different men's envy to friend.
I am sure some women/women friendship is = are stronger than men/men friendship but it's rare.
in most wedding there are taking photo time, men's friends are more than women's. i don't know their friendships is how strong.= I don't now how strong is their friendship  just i say men's friendships are continue than women's. = I just think that men's friendship are continuous than women's.