You don't need to get fucked in the ass to figure out that's NOT what your ass is supposed to be used for. It's logical and scientifically proven, therefore it is not a matter of having to experience it firsthand. Just because some people decided that's what they want to user their ass for doesn't mean everyone else should try to see that it's not something they wish to try. It's very similar to organized religion and alot of people's beliefs. Some of the things people chose to believe to me are just as silly as getting fucked in the ass, but if that's what they want to do, then have at it, because I really don't care. Just don't try to convince me it's the right thing to do because you want to justify your own beliefs.
The definition of "faith" says it all: a firm belief in something for which there is no proof.
Contrast that with the definition of belief: conviction of the truth of some statement or the reality of some being or phenomenon especially when based on examination of evidence.
I can't help but laugh to myself everytime someone mentions faith and belief in the same sentence.