Up until 6 weeks male and female fetuses are undifferentiated sexually; they both have the same parts. At this point if there is a Y chromosome present then androgen starts being produced and the gonads drop down to form the testicles. (In the female they don’t move and form the ovaries.)
Their progression through the male’s body leaves weaknesses in his musculature that will exist throughout his life. Also, for bipeds like humans, all of the weight of the organs in the abdominal cavity are resting on the pelvis while they are standing. (Unlike quadripeds who have the weight of their organs spread across their abdomen while they walk.)
These conditions sometimes combine to cause a breach in the muscular wall of the lower abdomen pushing some of the bowels through. This condition is known as an inguinal hernia. (There are other hernias that form at weak spots in the abdominal wall such as the naval (umbilical hernial) or because of damage (incisional hernia).)
The point of the science lesson for the day is I have an inguinal hernia. If all goes as planned on Friday afternoon I won’t anymore. =) Hernias are structural problems and though they can get worse with time, they won’t ever get better. I’m going into surgery bright and early at 6:00 in the morning. It is an outpatient procedure and I will hopefully be home healing by the afternoon.