This urge to release the secret into the wild, no matter how detrimental it might be to that mans life provides a sense of solace to the man that at least the secret was released on his own terms and in a way that he would not be so publicly shamed in the way he would if it was found out by a network of rumours. The combination of a strong subliminal desire to be humiliated and the urge to let everyone know are usually too much for the small dicked man to bear, hence, the reason why most small dick men are willing to show off their size.
Who is best placed to supply SPH? in a single word "women" there is simply nothing more humiliating than a woman berating the size of a mans penis, it is as humiliating for the man as it is empowering for the woman. Typically, only a woman who is feeling hurt will dispense SPH but it should be encouraged in all women at all times to practice this. Normally men are less capable at supplying SPH to each other as this is one of the occasions where they have compassion for their fellow man.
If you are looking to try giving SPH, you should focus on the worthlessness of the penis, for maximum effect, do so where possible, AFTER the man has reached climax, his penis is already shrinking and there is absolutely no way to prevent this from happening, if possible, do not permit him to re dress, this will give you ample opportunity to examine his reducing penis. The best possible SPH will stem from him being tied up naked and exposed, the motivation to grow or become erect will dissipate very rapidly and he will be left with just a flaccid penis on display.
As we broach being tied up naked, we encroach into fem-dom territory, this will further emasculate the man to ensure he experiences maximum shrinkage. A freshly shaved genital area will exaggerate this further and where possible, being exposed outside in the cold, will perform the maximum shrinkage. If you haven't seen a small penis contract completely, this is going to be a special moment so have the camera ready.
How was this research conducted? personal experience, I am a man, I have a tiny dick, I receive humiliation, I expose myself on webcams and share pictures of myself online, I go to nude resorts, I walk through the gym locker room, I have been skinny dipping, I know how small my dick is but I act like its no big deal, deep down I know how worthless/useless it is and how I need that humiliation.