Somebody should have warned me!

How come nobody ever warned me about what happens when you say "yes" to a Mary Kay lady?! A new girlfriend at work had recently approached me to let me know A) she sells MK and B) she wanted to give me a facial. I have never had anything to do with MK before so I said sure and invited my friend Kayla along for the fun. Well now I have learned that I have to host two more "sessions" a make over one and a fragrance one and I had to hand over names and phone numbers of people I know that would like to come. (umm, nobody) While I did have fun last night and I came away with some new time-wise face wash, I am a little iffy about my friends being called and having another one of these things at my house. I did however already send out an email to my five friends giving them a heads up about the call they will be receiving soon. While I think the make over session will be fun I have no desire to to a fragrance one. I have a fragrance I wear, I will not be changing anytime soon... can somebody who knows about MK please tell me a polite way to get out of these things?!