hmmm...this is easy to jump to a negative conclusion but let's assume two things:
1)this is a compulsion of the husband, not just a whim. we all know how difficult compulsions are to ignore ....they don't go away by wishing them away either. perhaps with some limits established a compromise could be worked out.
2)the request does not sound too imposing or disgusting, as some implied. it could easily be worked into a little routine without any undue consequences, and perhaps save a marriage.
(with two kids)....is this really so insurmountable?
i like mellors suggestion of a tradeoff of sorts also.
it doesn't sound like the wife will even try to accommodate him.