I guess I don't know what your W's physical problem is but IMO, no matter what the sich, desire is the key. My sister had serious cervical cancer and had to have a hysterectomy and cervical radiation. She has been seriously frustrated because sex is painful for her now but her desire for sex, as always, is very high. So, she told me that the other night she just pushed through the barrier and made the pain part of the experience and she said the sex ended up being red hot in a S&M pain mixed with pleasure kind of way.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver