Disabled rights: Can mentally challenged man stay in marriage he might not understand?

In the cold and decidedly unromantic eyes of the law, “Marriage is a personal relation arising out of a civil contract between two persons, to which the consent of the parties capable of making that contract is necessary.”
So can a man like Ryan Morris – whose mental abilities at age 24 run at roughly a kindergarten level, with disabilities so severe he can’t think abstractly, manage money or care for himself – give informed consent to a marriage and sexual rel