The male factor in fertility and infertility. 7. Semen quality in relation to age and sexual activity.
D005298:Fertility; D006801:Humans; D007246:Infertility; D007248:Infertility, Male; D008297:Male; D012661:Semen; D055101:Semen Analysis; D012725:Sexual Behavior
FERTILITY; SEMEN; STERILITY, MALE