ERECTION 
 
A friend of mine, a 40 years old lady confessed that her husband about 5 years older than her has a problem of erection.  Once, at dawn on her birthday, her husband being horny, woke her up and want to make love at that instant.  He make her undress quickly.  There is a problem though, she hasn’t done taking her clothes off when her husband’s penis go weak.  BUM! no more erection.  Why do you think it happen?