The male factor in fertility and infertility.  VI.  Semen quality and certain other factors in relation to ease of conception.
D003075:Coitus; D005298:Fertility; D005306:Fertilization; D006801:Humans; D007246:Infertility; D008297:Male; D012661:Semen; D055101:Semen Analysis
COITUS; FERTILITY; SEMEN