a man with a low 'sperm count' [=a man whose body produces few active sperm]
The 'sperm' fertilizes the egg.
(..) Who is it? We can't see. Turn us. Turn us. Go ahead, tell my parents why they won't have any grandchildren. How would I know? Do you have a low sperm count? This has nothing to do with my sperm count. You are wearing the boxers that we sent you, aren't you? Yes, Mommy. (..)2007 TvShow: The Big Bang Theory Title: The Grasshopper Experiment Season: 1 Episode 8