y, 192-195
insanity, 147
judgments on masturbation, 192-195

Morality. _See also_ Sexual morality
and custom, 249, 250
and nakedness, 256, 257, 260
sexual, Catholicism and, 274-276

Morality-fanatics, 259, 260

Morbid heredity. _See_ Congenital predisposition

Mother, the, and the sexual enlightenment, 295-297

Motherhood, pre-marital, 287

Motherhood protection, 323

Music-hall artiste, 209

_Mutterschutzbewegung_, 323

NAIL-BITING, 173

Nakedness. _See also_ Nude, the
and sexual morality, 256, 257, 260

Narcolepsy, 185

Necrophilia, 234

Nervous system, abnormal, 146

Neurasthenia, 14, 190
from masturbation, 187
sexual. _See_ Sexual neurasthenia

Neurologists and the study of the sexual life, 147

Neuropathia, 146. _See also_ Congenital predisposition

Neuroses and sexual experiences (Freud's theories), 189-191, 226,
277-279

Newspaper advertisements, perverse, 240-245

Newspapers, the erotic in, 261, 262

Night-lodger, 220, 248

Nocturnal emissions. _See_ Sexual dreams

Non-sexual erections, 171
manipulations of the genital organs, 171

Nose-picking, 171

Nubile, defined, 3, 4

Nude, the, in art, 258-260

Nuns, sadistic, 239

Nurses and masturbation, 52, 158, 159, 225

Nymphae, 23

Nymphomania, 181

OBJECT of sexual practices, the child as, 219-245

Objective elements of the sexual enlightenment, 290, 291

Obscene conversation, 153, 156

Observation of sexual acts by children 161, 162
of sexual processes in young children, 164
of the sexual life, 6
sexual differences in, 41

Obsession by erotic ideas, 179

Occupation and sexual offences against children, 221, 232, 233
and sexual perversion, 209, 210

Offences, sexual. _See_ Sexual offences

Offspring of child-marriages, 214, 215

Onanism. _See also_ Masturbation
defined, 87, 165
psychical, 166

Oophorectomy, effects of, 106

Operation to remove foreign bodies from vagina or female bladder, 166

Ophthalmia of the new-born, 283

Opportunity and the sexual enlightenment, 293

Orchitis, 192

Organs, genital. _See_ Sexual organs

Organs, reproductive. _See_ Sexual organs

Orgasm, involuntary sexual, 3, 94-98
defined, 3 _n._
sexual, 22, 23, 25, 26, 57-59. _See also_ Voluptuousness
signs of, 164, 165
without ejaculation, 185