Marriage is a life-style choice! I don't believe either sex "needs" marriage. Living life is about striving to get the things you (want). Truth be told there are only 5 things us adults need to live. (air, water, food, shelter & clothing). Anything beyond those five items falls under the catagory of (want or would be nice to have).
I suspect one of the reasons married men live longer is their wives push for them to visit the doctor more than a single man is likely to go. Early dectection of any diseases tends to prolong one's life. One man's opinion!:-)