The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family. The most comfortable relationship between the sexes, sex determines the happiness of the family.