Ask a Lawyer and Get Answers to Your Legal Questions
It is not illegal so long as you didn't lie on the insurance forms. If you misrepresented the fact that you are married and you're not, that could invalidate the policy.
Also, any other misrepresentations could cause the policy to be denied when payment is sought.
You shouldn't expect to be charged with a crime if this is the case, the only real penalty is that the policy will be void.