 
- Abolitionism, 316
- Abortion, artificial, 408, 440
- Abstinence, sexual, 114
- Accouchement, 60
- Adornment, 156
- Adultery, 373, 412
- Alcohol, effect on embryo, 37, 268, 462
- Altruism and Egoism, 448
- Amorous Intoxication, 277, 288
- Americanism, 331
- AnÆsthesia, sexual, 222
- Anthropoid apes, 145, 195
- Anticonceptional measures, 423, 497
- Antipathy, 108
- Antony and Cleopatra, 289
- Ants, 194, 359
- Art, moral effect of, 496
- in sexual life, 489
- of loving long, 520
- and pornography, 491
- Aspermia, 209
- Assaults on minors, 403
- Atavism, 29
- Attraction, methods of, 156
- Audacity, masculine, 115
- Bachelors, old, 127
- Bartholin's glands, 57
- Beauty, 162
- Becket, 352
- Bees, 194
- Bernheim, 277
- Bestiality, 255
- Bezzola, 268
- Birth, 23
- Blastophthoria, 36, 268
- Braggardism, sexual, 120
- Brain, weight of, 66, 190
- Brieux, 407, 438
- Brothels, 303
- clandestine, 307
- high class, 310
- Budding, 9
- Bullies, 303
- Butterflies, 74
- Caelius Aurelianus, 399
- Caligula, 353
- Castration, 25
- Catherine de Medici, 353
- Catholicism, Roman, 341
- Cell division, 6
- Celibacy, 153
- Children and marriage, 377
- civil rights of, 378
- education of, 471
- protection of, 487
- Chiniqui, 342
- Chauvin, de, 36
- Civil law, 368
- Civil marriage, 370
- Climate and sexual life, 327
- Clitoris, 55
- Coeducation, 481
- Coitus, 56
- Commandments, 454
- Conception, regulation of, 423
- Concubinage, 322, 406
- Confession, Roman Catholic, 342
- Conjugation, 11
- Consanguinity, 47
- Constellations, 110
- Continence, 81, 220, 422
- Coquetry, 139
- Corpus cavernosum, 53
- Correggio, 355
- Correlative sexual characters, 25, 64
- Council of Trent, 172
- Cunnilingus, 230, 275
- Darwin, 32, 34, 39, 480
- Debreyne, 345
- Decidua, 19
- Demosthenes, 187
- Divorce, 373
- Domestic animals and plants, 514
- Dubois, 46
- Duty, 106
- Ecphoria, 15
- Ecstasy, 143
- ecstasy and religion, 356
- Education, 470, 516
- Egoism, 361
- Egoistic love, 125
- Embryo, formation of, 9
- Embryology, 19
- Endogamy, 164
- Engram, 15
- Environment and sexual life, 326
- Epididymis, 52
- Epispadias, 210
- Erection, 53
- Eroticism, 121, 485
- Erotomania, 258
- Ethnology of sexual life, 144
- Eunuchs, 25, 347
- Evolution, 39
- Exhibitionism, 241, 405
- Exogamy, 164
- Expiation, 364
- Factory life, 326
- Fakirs, 239
- Fertilization of eggs, 12
- Fetichism, 142, 240
- Fischer, 36
- Flirtation, 99
- Free love, 384
- Free will, 365
- Genital organs, female, 55
- Germinal cells, 10
- Goethe, 73, 131
- Gonorrhea, 212
- Grisettes, 98, 322
- Guardianship, 384
- Guillaume, 399
- Haeckel, 10, 34, 40
- "Hand-fasting," 150
- Heredity, 14, 28
- of acquired characters, 34
- Hering, 14, 35
- Hermaphrodites, 10
- Hertwig, 11
- Hetaira, 187, 323
- Hirschfeld, 242
- History, mental anomalies in, 350
- Homophony, 16
- Homosexual love, 241, 251
- Hottentots, 347
- Human selection, 412, 509
- Hybridity, 47, 163
- Hymen, 55
- HyperÆsthesia, sexual, 225
- Hypnotism, 277
- Hypochondriasis, 232, 261
- Hypocrisy, sexual, 123
- Hypospadias, 210
- Ideal Marriage, 517
- Idealism, 132
- Idiots, 410
- Imaginary love, 263
- Impotence, 85, 219
- Incest, 402
- Insane, sexual anomalies in, 256
- Internats, 338
- Inversion, sexual, 241, 251
- Inverts, marriage of, 378
- Irradiations of love, 115, 128
- "Jack the Ripper," 234
- Jealousy, 104, 117, 139, 260
- Joan of Arc, 351
- JÖrger, 331
- Jus primÆ noctis, 151
- Keller, 356
- Kinship, 107
- Krafft-Ebing, 142, 208, 234, 404
- Lamarck, 39
- Landerziehungsheime, 477
- Lesbian love, 275
- Liguori, 341
- Lorettes, 322
- Love, 111
- Love and sexual appetite, 104
- maternal, 135
- and religion, 143
- Lubbock, 181
- Lycurgus, laws of, 466
- Marchal, 18
- Mariage de convenance, 91
- Marriage by purchase, 170
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