Do you all know the difference between a man and a woman?  Hormones.  That's all there is to it.  We are all conceived female and those with x/y chromosomes release testosterone from the interstitial cells on the 14th day after conception, causing the ovaries to descend down the inguinal canal an create testes, and other male expressions.
Also the chance of a coin coming up head or tails I don't care how many times in a row is constant, 50%.  Always 50%
P(A) = N/0 
  where 
  P(A) equals Probability of any event occurring
 N is the Number of ways an event can occur and
 0 is the total number of possible Outcomes
and the author is a member of a "think tank" Now that's the real question...