Third is right. Testicles are supposed to be cooler.
But a penis head? Is it cold when its erect? Coldness causes constriction of veins, it s unlikely to have a cold erect penis head. Heat causes Vaso-constriction, which means veins expends and therefore letting blood flow. Try applyin some heat and see what happens.
my glans get a bit chilly sometimes. i think its from over-working. I tend to do stretches randomly throughout the day, thats why mine are cold i think.
i keep my rice sock on there for 10-15 minutes :\ i keep i t around the base of my penis and the head and a little skin sticks out the top.. most of the time i sit here and browse the forum while i warm up