Marriage--Rules of Heredity--Pauperism--Difference Between Pauperism and Poverty. XXXII. BIRTH CONTROL OR THE LIMITATION OF OFFSPRING 244 Knowledge of Prevention of Conception Essential--Misapprehensions Concerning Birth-control Propaganda--Modern Contraceptives Not Injurious to Health--Imperfection of Contraceptive Measures Due to Secrecy--Prevention of Conception and Abortion Radically Different--More Marriages Consummated if Birth-control Information were Legally Obtainable--Demand for Prostitution Would be Curtailed--Venereal Disease Due to Lack of Knowledge--Another Phase of the Birth-control Problem--Knowledge of Contraceptive Methods Where There Was a Taint of Insanity, and the Happy Results. XXXIII. ADVICE TO GIRLS APPROACHING THE THRESHOLD OF WOMANHOOD 261 The Irresistible Attraction of the Young Girl for the Male--The Unprotected Girl's Temptations--Some Men Who Will Pester the Young Girl--Risk of Venereal Infection--Danger of Impregnation--Use of Contraceptives by the Unmarried Woman May Not Always Be Relied Upon--Nature of Men who Seduce Girls--Exceptions--Illegitimate Motherhood--Difficulties in the Way of Illegitimate Mother Who Must Earn Her Living--The Child of the Foundling Asylum--Social Attitude Towards Illegitimacy Responsible for Abortion Evil--Dangers of Abortion--The Girl Who Has Lost Her Virginity. XXXIV. ADVICE TO PARENTS OF UNFORTUNATE GIRLS 273 Attitude of Parents Towards Unfortunate Girl--The Case of Edith and What Her Father Did--The Pitiful Cases of Mary B. and Bridget C. XXXV. SEXUAL RELATIONS DURING MENSTRUATION 279 Heightened Sexual Appetite of Many Women During Menstruation-- Sexual Intercourse During Menstrual Period--When Intercourse May be Permitted--Injection Before Coitus During Menstruation--Fallacy of Ancient Idea of Injuriousness. XXXVI. SEXUAL INTERCOURSE DURING PREGNANCY 282 Complete Abstinence During Pregnancy--Bad Results of Complete Abstinence--Intensity of Relations During First Four Months-- Intercourse During Fifth, Sixth and Seventh Months-- Intercourse During Eighth and Ninth Months--Abstinence After Birth of Child. XXXVII. SEXUAL INTERCOURSE FOR PROPAGATION ONLY 284 Belief in Sexual Intercourse for Propagation Only--What Such Practice Would Lead to--Nature and the Sex-fanatics--Sexual Desire in Woman After Menopause--Sex Instinct of Sterile Men and Women--Sex Instinct Has Other High Purposes. XXXVIII. VAGINISMUS 288 Vaginismus--Dyspareunia--Difference Between Vaginismus and Dyspareunia--Adherent Clitoris a Cause of Masturbation and Convulsions. XXXIX. STERILITY 291