1. It will last for at least four hours.
 2. It does not get interrupted once a month.
 3. It is safe to do at any time.
 4. If you don't know how to do it, you can cheat.
 5. You don't have to be embarrassed about doing it in public.
 6. You can do it with several people at the same time.
 7. You don't get jealous ify our roommate does it loudly.
 8. You can be proud if you finish sooner than your roommate.
 9. You dont get tired if your roommate does it all the time.
10. You don't care is your roommate has done it before or not.
11. You don't have to lie to your roommate about his/her performance.
12. You can do it with members of the same sex without shame.
13. You and your roommate can do it together and still be friends afterwards.
14. You can do it with your teacher and not be friends afterwards.
15. You can do it with teenagers as a part-time job.
16. You can do it with college students as a full-time job.
17. You dont have to wait for ten months for the results.
18. You don't have to feel guilty about doing it alone.
19. You dont have to pretend you enjoy it.
20. You can eat or sleep while doing it.