How preposterous some aspects of  sexual relations between humans have become in our western  world (or at least Canada and US), when anyone could think that couples living together need explicit consent every time one of them wants to have sex together. Unless they explicitly agreed to such an arrangement (specific consent each time), or there is such a level of abuse that the one subject to it is incapable of saying no, out of fear, it should be simple; unless one says explicitly " no, not (that way) tonight darling" or its physical equivalent, then its  consensual sex by implication of the relationship, (and that includes if one is drunk or asleep, absent violence).  And if a couple comes from a culture where it is assumed the man is entitled to have sex with his wife, and she assumes it his right AND SAYS NOTHING, even if she is unwilling, no possible assault can occur. The Feminist movement if this continuous explicit consent is part of it, is simply nuts on this matter.