Marriage is the social institution under which two consenting adults establish their decision to live as spouses.marriage is the social institution under which a man and woman establish their decision to live as husband and wife while friendship is a person attached to another by feelings of affection or personal regard
see it is possible in one sentence
See, I've made it even better.
As for friendships, you apparently have sex with your friends but the vast majority of us do not.
Always willing to help, Kuntmary.