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Researchers and Methods
The Biological Man
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abortion adolescent adults attitudes become biological birth control body boys breast cause Chapter child clitoris cohabitation coitus communication Concept Check condom contraception couples described disease divorce early effective ejaculation emotional erection erotic estrogen experience extramarital feel Female and Male fertility Fertility awareness fetus frequently gender genital girls glands groups heterosexual homosexual hormones human human sexuality infant infection involved Kinsey lesbian live marital marriage married Masters and Johnson masturbation menstrual months mother occur older orgasm ovulation paraphilia parents partner penis person physical pleasure pregnancy prostate prostitutes psychological rape relationship reported reproductive result role sex research sexual activity sexual arousal sexual behavior sexual intercourse sexual problems sexual relations Sexually Transmitted Diseases single social sometimes sperm spermicide spouse stimulation suggest talk techniques testes tion TIPS FOR BETTER touch treatment usually uterus vagina woman women young