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Subclass HQ
| HQ1-2044 | The Family. Marriage. Women | ||
| HQ12-449 | Sexual life | ||
| HQ19-30.7 | Sexual behavior and attitudes. Sexuality | ||
| HQ31-64 | Sex instruction and sexual ethics | ||
| 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 | ||
