I just saw a medical study where stimulation of Male nipples excited the same brain region as stimulation of the prostate or deep penile stimulation. The same study noted that stimulation of nipples produced reactions in penile tissue independent of experience, meaning they are, in effect, hard-wired together. Add in another effect, that the use of intensive muscular effort will tend to be gross rather than focused (as for example, when you run, you use leg, hip, back, abdominal, pectoral, shoulder, and arm muscles), so, when you exert to empty bowels, you compress even pectoral muscles, and nipples erect, not by spongiferous expansion, like the penis, but by muscular expansion, like the tongue. So, a combination of nerve connections and muscular interactions produces that effect. It's normal. It proves all your systems are working nicely.
Is it normal when I poop my nipples get hard...?
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I just saw a medical study where stimulation of Male nipples excited the same brain region as stimulation of the prostate or deep penile stimulation. The same study noted that stimulation of nipples produced reactions in penile tissue independent of experience, meaning they are, in effect, hard-wired together. Add in another effect, that the use of intensive muscular effort will tend to be gross rather than focused (as for example, when you run, you use leg, hip, back, abdominal, pectoral, shoulder, and arm muscles), so, when you exert to empty bowels, you compress even pectoral muscles, and nipples erect, not by spongiferous expansion, like the penis, but by muscular expansion, like the tongue. So, a combination of nerve connections and muscular interactions produces that effect. It's normal. It proves all your systems are working nicely.