Yes. It is illegal in Nevada to use force…or threats of force…to sexually assault one's spouse. However, it is legal in Nevada to have sex with one's spouse without his/her consent as long as the person did not use force or threats of force: An example of this would be when the spouse is sleeping, unconscious, very intoxicated, or otherwise unable to give consent. But even then if the unconscious spouse feels like he/she was raped and makes a police report, the prosecutor can still try to bring charges and put the matter to a jury.
Read our article about the Nevada crime of spousal rape. Also refer to our article about the history of spousal rape in California.