1. Beach CA, Bianchine JR, Gerber N: The excretion of caffeine in the semen of men: pharmacokinetics and comparison of the concentrations in blood and semen. J Clin Pharmacol. 1984 Feb-Mar;24(2-3):120-6. doi: 10.1002/j.1552-4604.1984.tb02774.x. [PubMed:6715563 ]