It can be grounds for annulment but there are certain time factors and other factors involved which would make this a judgment call.
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Lack of consummation is grounds for annulment, but no one is exactly sure what "consummating a marriage" means. Today, many people think it means having sex for the first time after the wedding ceremony. But that's probably not what it means, and failure to have sex after the ceremony probably isn't grounds for annulment. Historically, "consummation" meant "to begin" a marriage. "Beginning" a marriage means to tell people you are married, starting a household together, moving in, reporting on forms that you are married, things like that. As long as you do those things, the marriage is probably consummated. But more to your point, all a marriage requires to be legal is a license and a ceremony. As long as you got a marriage license and you had a wedding ceremony, your marriage is legal.
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