While I love porn stars, seeing people I know naked or having sex is infinitely hotter.  I've seen 3 or 4 couples I know have sex, and it was fun.  A really good friend of mine also showed me some pics of her playing with herself, and it was easily the hottest thing I've ever seen.  I've also seen who I think is my ex in a college fuck fest video, and that was pretty damn awesome too.  So, for me, definitely friends over porn stars. 
