The law varies from state to state as to the definition of sexual assault, and sexual battery. The following is link to the California Penal Code 261-269. Although 261 (a) suggests that a person’s spouse cannot commit rape this is not true. A husband can be detained, arrested and prosecuted for sexual violence. Readers are encourage to contact their nearest police department to discuss related concerns.
California penal code clearly stipulates that sexual assault occurs when
(1) Where a person is incapable, because of a mental disorder or developmental or physical disability, of giving legal consent, and this is known or reasonably should be known to the person committing the act. Notwithstanding the existence of a conservatorship pursuant to the provisions of the Lanterman-Petris-Short Act (Part 1 (commencing with Section 5000) of Division 5 of the Welfare and Institutions Code), the prosecuting attorney shall prove, as an element of the crime, that a mental disorder or developmental or physical disability rendered the alleged victim incapable of giving consent. (2) Where it is accomplished against a person's will by means of force, violence, duress, menace, or fear of immediate and unlawful bodily injury on the person or another. (3) Where a person is prevented from resisting by any intoxicating or anesthetic substance, or any controlled substance, and this condition was known, or reasonably should have been known by the accused. (4) Where a person is at the time unconscious of the nature of the act, and this is known to the accused. As used in this paragraph, "unconscious of the nature of the act" means incapable of resisting because the victim meets one of the following conditions: (A) Was unconscious or asleep. (B) Was not aware, knowing, perceiving, or cognizant that the act occurred. (C) Was not aware, knowing, perceiving, or cognizant of the essential characteristics of the act due to the perpetrator's fraud in fact.