If you want a strong opinion from someone, ask them about penises!
OT: Personally I'm not circumcised, and neither is my brother, or my step-father. In Australia, circumcision is not the norm, but neither is it completely unheard of.
I am of the opinion that circumcision is likely to decrease sensation in the penis, for two reasons.
Firstly, no matter how you look at it, you are removing a part of your penis, and that will have consequences of some kind. That doesn't necessarily mean it will be a loss of sensation, but to me it seems likely.
Secondly, the foreskin acts to protect the glans (the most sensitive part of the penis) from both from dirt and the like (though it's effectiveness is debatable), and prevents the glans from being stimulated when the penis is not erect. To me, the logic goes; if the glans is unprotected, it is likely to be stimulated more often, meaning that the sensation is either going to become commonplace (i.e. not exciting) or you're going to stop interpreting certain stimuli as sexual. This to me suggests that sex will not feel the same, as you would not be experiencing the full range of sensations as a non-circumcised person.
Naturally, these are just my lines of reasoning, and I've done little to no research on the matter. My opinion is biased, being not of the circumcised variety. To me this whole discussion will boil down to socks defending why they are socks, and helmets defending why they are helmets. Also, a few people have tried making the point that one or the other looks weird, and that women consider one or the other weird. This is entirely subjective, but I think you'll find very few women will be 'disgusted' one way or the other. They might have a preference for one or the other, but at best that gives you a 50/50 chance of being their preference. I do know at least one girl who preferred non-circumcised penises (and thought circumcised penises looked weird).
As for female circumcision... I have no defense for it, I think it is an abhorrent act. To me, this is straight up genital mutilation and unlike male circumcision, I cannot see any objective reasons for why it should be carried out.
EDIT: Oh, and somebody asked a question about how 'cut people' fap. One of the pro-circumcision (and I assume circumcised themselves) people responded that we fap in the same way, but this is not strictly true. Non-circumcised men have two choices; they can use their foreskin to fap, or they can use lubricant. It is my understanding that unless they want to risk friction burns, circumcised men require lubrication.
