Wife Does'nt Know How to Communicate About Sex

My wife for years has not liked sex, touch of any kind, intamacy at all, and to make it worse she wont "talk" about it. She just wants to argue the fact that I need these things. She makes up all kinds of excuses of why and can change four or five times during an argument. She seems to be more worried about her "image" as a wife than the real problem of not want to disscuss or act out any intamacy. She tries after my two hour convincing for about three days and then back to none..and she thinks that normal...We are 36 and 32....and we are very attractive couple so looks are not the problem I'm a great dad and try to be a good husband but this topic is killing our marraige from the inside.....If I could just get her to submit and agree to work together I think things would start to get better, but she is very head strong and doesnt say i'm sorry or i'm wrong AT ALL unless she is being sarcastic. What now????Please we have many issues here pick one.....I'm not perfect either but I realize the problems..