omg what if she has multiple orgasm? still can last for 39 mins?
haha u all torturous sia!
What's wrong with that? On the contrary, won't she enjoy the
'torture' all the more? 
For your info, the world record for the largest number of
orgasms enjoyed by a single woman in an hour is 134...... so you
say lor, 39 min, can last or not? 