I am, but my step-brother is not.
I will say this immediately... I am so glad I am. I think my parents made the right choice just by the experiences that I have had versus what my step-bro has gone through.
On the other hand though.. if it had not been done to me when I was born I would be leery of having that kind of alteration done this late in life. I think it would change the experience that you have during sex and other various activities that you may or may not expect. I mean, if he doesn't like it... he can't simply reattach it. I have heard that some say that men lose some sensation after having this done, but I can't attest to that since I have never known otherwise. But, I will say that I have no problems with a lack of sensation, personally. I one time nearly threw my wife off the bed because it was being tickled too much... (draw your own conclusions here). All in all it's your friends choice, but I would really be apprehensive at this point.