Copulation and the inhibition of pregnancy in rats.
D000818:Animals; D002584:Cervix Uteri / Q000502:physiology; D003267:Contraception; D003307:Copulation; D004542:Ejaculation; D005260:Female; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D051381:Rats; D012726:Sexual Behavior, Animal