You may not be aware of it, but there is law out there saying that this can be done and men have been convicted in a court of law. Its a definite fact.
Just to make it clear so nobody gets the wrong idea here ...
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Marital rape, also known as spousal rape, is non-consensual sex in which the perpetrator is the victim’s spouse. It is a form of partner rape, of domestic violence, and of sexual abuse. Marital rape is today illegal in all 50 US states.
The legal history of marital rape laws in the United States is a long and complex one, that spans over several decades. The criminalization of marital rape in the United States started in the mid-1970s and by 1993 marital rape became a crime in all 50 states, under at least one section of the sexual offense codes. At that time, most states differentiated between the way marital rape and non-marital rape were treated. The laws have continued to change and evolve since 1993, but in some states, there still remain differences.
http://en.wikipedia.org/wiki/Marital_rape_(United_States_law)