In the 1970's, before women were allowed to sign up for combat duty, a man was bragging to his friends about how his sister disguised herself as a man and was able to join the army.
"But, wait a minute," said one listener, "She'll have to dress with the boys and shower with them too.
Won't she?" "Sure," replied the man.
"Well, won't they find out?" asked his friend.
The man shrugged and replied, "But who will tell?"