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actually adolescence adults animals answer asked aspects of sex attitude to sex baby behavior biology birth blood body born boys and girls cause child club coeducational concerned consideration contraception course curiosity CYRIL BIBBY deal detailed difficult discussion emotional fact fairly father feel female fertilized frog give glands gonorrhea grow happens Health heredity homosexuality human hygiene important infection instruction interest knowledge lectures lessons male marriage married masturbation matter means menstruation moral mother Mummy nature necessary normal nudity older ovaries ovum parents parthenogenesis particularly penis perhaps period person physical physiology possible problems Progressive Education Association pupils queries questions semen seminal emission sex and reproduction sex education sex organs sexual intercourse sexual relations simple social society sometimes sort sperm suggestions syphilis teacher thing tion understanding usually vagina venereal diseases woman womb women young youth leaders