A pregnant woman and her husband asked the doctor if it was okay to have 
sex during her pregnancy.   He told them that during the first trimester 
they could do it normal-style, during the second trimester they should 
do it dog-style and during the third trimester they were limited to wolf-style.  
'Wolf-style?' queried the husband. 'What's that?'
'You lie next to the hole and howl,' replied the doctor.