To PPPH -

if you were my sister I would come to your wedding and celebrate. May you have a happy life with your partner.

To the male grad student,
Take it from me, who suffered through a similar marriage... Do not get married if there is no physical connection. You are just friends. I am still suffering many years later from confidence issues because my wife didn't want me in that way. I always felt there was something wrong with me. I later learned that there is absolutely nothing wrong with me. But the damage is done and after years of counseling and dating i still have confidence issues even though I am talented, good looking, and have a good career. Not worth it. Marry someone that wants to consummate the marriage and please you because that is what romantic love is.
Just my .02

To GETOUT, your name says it all. That sounds terrible. Find someone who truly loves you. She's manipulative and selfish. Obviously I'd never tell her to have sex if she doesn't want to, but keeping you in a relationship that doesn't fulfill your needs is very selfish. It also sounds like she doesn't support you in other ways. Get out for your own well-being, and find someone who makes you happy!