You'd rather get an easy one.
You get in a lot of trouble if you get caught cheating on one.
If you are drunk when you do one, it takes a lot longer to finish.
The less they have on them the better.
If you have more than one scheduled at the same time, you have a problem.
Nothing about them makes any sense.
They just lie there and you have to do all the work.
When you are done you get up and leave.
Good curves make for a more enjoyable experience.
[tags]girl joke, finals joke[/tags]