The Library of Congress classification for relationships and marriage is HQ. More specifically, HQ is broken down as follows:
- HQ1-2044 The Family. Marriage. Women
- HQ12-449 Sexual life
- HQ19-30.7 Sexual behavior and attitudes. Sexuality
- HQ71-72 Sexual deviations
- HQ74-74.2 Bisexuality
- HQ75-76.8 Homosexuality. Lesbianism
- HQ77-77.2 Transvestism
- HQ77.7-77.95 Transexualism
- HQ79 Sadism. Masochism. Fetishism, etc.
- HQ101-440.7 Prostitution
- HQ447 Masturbation
- HQ449 Emasculation. Eunuchs, etc.
- HQ450-472 Erotica
- HQ503-1064 The family. Marriage. Home
- HQ750-755.5 Eugenics
- HQ755.7-759.92 Parents. Parenthood Including parent and child, husbands, fathers, wives, mothers
- HQ760-767.7 Family size
- HQ767.8-792.2 Children. Child development Including child rearing, child life, play, socialization, children's rights
- HQ793-799.2 Youth. Adolescents. Teenagers
- HQ799.5-799.9 Young men and women
- HQ799.95-799.97 Adulthood
- HQ800-800.4 Single people
- HQ801-801.83 Man-woman relationships. Courtship. Dating
- HQ802 Matrimonial bureaus. Marriage brokerage
- HQ802.5 Matrimonial advertisements
- HQ803 Temporary marriage. Trial marriage. Companionate marriage
- HQ804 Breach of promise
- HQ805 Desertion
- HQ806 Adultery
- HQ811-960.7 Divorce
- HQ961-967 Free love
- HQ981-996 Polygamy
- HQ997 Polyandry
- HQ998-999 Illegitimacy. Unmarried mothers
- HQ1001-1006 The state and marriage
- HQ1051-1057 The church and marriage
- HQ1058-1058.5 Widows and widowers. Widowhood
- HQ1060-1064 Aged. Gerontology (Social aspects). Retirement
- HQ1073-1073.5 Thanatology. Death. Dying
- HQ1075-1075.5 Sex role
- HQ1088-1090.7 Men
- HQ1101-2030.7 Women. Feminism
- HQ1871-2030.7 Women's clubs
- HQ2035-2039 Life skills. Coping skills. Everyday living skills
- HQ2042-2044 Life style
For works on the psychology of sex or sexual behavior, see BF692-692.5. Browsing in any of these areas may lead to the discovery of valuable material in addition to the specific items listed in this guide.
