Have you had an honest conversation about how this lack of sex makes you feel? I ask because if your wife is low drive then she probably doesn't think much about it at all. Kind of like how I think about beets. . .
Ask her to read the Sex Starved Marriage book. I think Michelle addresses the issue in a frank and caring manor. If you make it perfectly clear that the lack of sex affects you and the marriage, and if your wife does care about your emotional health, she will probably find a way to meet this need of yours.
I think you are doing each other a disservice dancing around this issue.
Oh your wife married you for lots of reasons, and she may even love you deeply. But she probably didn't marry you for sex. And even if she doesn't have a high desire she might enjoy knowing that she is giving something to you that you need to feel loved and happy.
I'm a man . . . But I can change . . . If I have to . . . I guess . . .