Small
For many guys, it's because having a large penis is perceived as being more dominant, whereas smaller CAN BE associated with being submissive. Long term chastity, applying lidocaine numbing cream, taking drugs such as Adderall and even inserting Sudafed into your urethra will shrink your penis. Over time, stopping increased blood flow into your penis will keep you from getting an erection. It also transfers your sexual pleasure from penile orgasms to anal/prostate orgasms, which can be very intense. So basically, your penis becomes simply an organ to allow piss to be removed from your body and nothing else.
Why is there such a stigma to having a small penis ?
I think a lot of it has to do with the mystery that is puberty and the fixation on growing and changing. Were told we are becoming adults GROWN UPS! None of us guys know what we are going to end up with on the other side of puberty. Well except for those of us with older brothers and even that isnt a guarantee that you will be similarly hung or unhung for that matter. Most boys become fixated on their growing genitalia and their peers as well. When we see a peer or friends or relatives penis and its larger many of us are in awe of a larger penis and hope to grow like they did. A lot of that I think is carried over into our adult lives that bigger is better which isnt true but growing up thinking that when we GROW UP and become adults or MEN we will have a larger penis. For those of use who dont grow or not that much it can feel as if we were cheated. Not sure if thats why such a stigma is attached to having a small penis but I think there may be a lot to that notion of boys being fascinated by there growing dicks carries over to adulthood. We all went through puberty and it sucks that guys who lucked out with bigger dicks stigmatize us smaller guys because none of us had anything to do with what we ended up with, its all in the genes that determines whats in the jeans..