Gah Pundendum you said it would be simple! :pI would have thoguht an increase in sympathetic activity would enhance erection stretngth since a contraction of penis smooth muscle would draw more blood to the area.
I find it a jump to suggest this change in SNS activity is enough to completely kill his erection though, even with genetic variability. As you said, there are probably other factors at work, too.
Gryphon are you a shower or a grower?
Simple is my middle name. :)
Sympathetic nerve activity will contract the vascular smooth muscle and act to expel blood from the cavernosa and spongiosum. Contraction of smooth muscle of the erectile chambers is the mechanism of erection reduction following ejaculation.
Not completely kill erection, just reduce EQ.
I personally am a grower and when I stand, I lose flaccid length and lose EQ when erect. I personally do not have a venous leak in my cavernosa; I do in my spongiosum (as does every male in the world).