"Some states," huh? WHICH states? How about the only one listed in this post, MO?
If you make such a statement, I'm gonna be looking for your legal citation link, from the OP's state. Or quit making statements. Your choice.
Sorry, I should have jumped on the OP by calling him/her a pedophile instead like the rest of the pack. Please accept my apology.
A quick search landed me
52 Am. Jur. 2d Marriage § 17
§ 17. Consent of parent or guardian
The public policy of some states is to discourage early marriage,[FN1] or to demand that the parents of minors consent to their assuming the responsibilities of matrimony.[FN2] Thus, statutory provisions in some jurisdictions require persons under a specified age to obtain the consent of parents to marry.[FN3]
It has been held that a marriage by an underage child without parental consent is voidable,[FN4] and that the marriage of one between legal age and the age under which parental consent is required, who has not obtained such consent, is generally valid,[FN5] except where a statute either expressly denies such validity or provides that without parental consent the minor is unable to give his or her own consent to the marriage,[FN6] However, there is also some authority for the view that a marriage contract entered into by a minor without the assistance of both parents is null.[FN7] Marriages by minors entered into without consent may be held to be valid even though parental consent has been obtained by fraud, such as by fraudulent misrepresentations that the parties were old enough to marry without parental consent,[FN8] or by deceiving the parents so as to obtain their consent.[FN9]
I do admit though I was vague in my response only because I was having a late lunch and didn't want to put the leg work into finding the specific state information. But looking a bit further...
451.090. Issuance of license prohibited, when--parental consent, when required
1. No recorder shall, in any event except as herein provided, issue a license authorizing the marriage of any person under fifteen years of age; provided, however, that such license may be issued on order of a circuit or associate circuit judge of the county in which the license is applied for, such license being issued only for good cause shown and by reason of such unusual conditions as to make such marriage advisable.
2. No recorder shall issue a license authorizing the marriage of any male under the age of eighteen years or of any female under the age of eighteen years, except with the consent of his or her custodial parent or guardian, which consent shall be given at the time, in writing, stating the residence of the person giving such consent, signed and sworn to before an officer authorized to administer oaths.
3. The recorder shall state in every license whether the parties applying for same, one or either or both of them, are of age, or whether the male is under the age of eighteen years or the female under the age of eighteen years, and if the male is under the age of eighteen years or the female is under the age of eighteen years, the name of the custodial parent or guardian consenting to such marriage.