Yes, for two reasons:

1. You give actually give a toss what people think about your actions

and

2.
Quote Originally Posted by dasamm
So in recitation today i walk in and sit down, she turns around and offers me a bite of her cinnamon bun. Very flirtaciously, but I am a good looking guy and am used to that.
Come on... you're a bloke... even if it's true you're not supposed to say it... unless you are Ali or fuccking Shaft or somebody... not some one who grasses up some slag and then worries about the Karma... :P

No need to alert your lecturer about it really, if she cheats her way through the whole entire course (unlikely) what ever peice of paper she gets will be useless when she enters the real world were she is expected to use the skills and knowlodge that she has gained.