Brazilain butt lift? Should I be scared?

I found out today that our county has a beach body trainer that works for the county. He contacted me today because I had been asking about P90X and said he had a class tonight and that if i came to the class he would answer any of my questions. Soooo I immediatly responded and said hell yea. Then I learned its a Brazillian butt lift class, ( what the hell is that) I work on my butt enough just by sitting on it all night. He said its all ladies in the class which made me quite happy. I have a feeling all of this ladies are gonna kick my butt( literallybecause I sit around on it all night) I am excited about it. He does 1 class a week and uses the different beach body videos( at least I think he uses the videos) I am gonna be a fish outt a water with all of these healthy ladies. I think I will hide in the back corner.

So those of you who have done it, How sore can I expect to be tomorow? Should I bring my heart rate monitor? I cant wait to go, I am gonna do some cardio prior for the simple fact I knwo nothing about it. I did look at beach bodies website and it was all ladies. Is it okay for a guy to even go this class?