Agree with all those saying that this is not an issue of a husband trying to have sex with his wife against her will. One of the problems with the judge's ill-chosen, or mis-quoted, comment is that opprobrium is now being heaped on the husband unfairly.
The problem with saying that, if you lack capacity to make other decisions (e,g financial/healthcare), you also lack the capacity to choose to have sex, is that this would mean many people with learning disabilities or acquired brain injuries never being allowed to have sex, when they might very much want to. It would mean that anyone who has sex with them is committing a crime. This would include, for example, couples with Down's syndrome in a long-term loving relationship - with each of them committing sexual assault every time they have sex, even if the sex is very much wanted by both.
This is what the court case is testing. Not - despite the reports- a husband's right to have sex with his wife. It's really the other way round- it's about the wife's right to a sexual relationship despite her intellectual impairment and without inadvertently criminalising her partner.