mattlapp,
I can’t say anything for others who hang, but my glans is is cool after every hanging session. I made a homemade bib hanger (the regular) last fall and then put some rubbery-foam stuff I found outside by the road on the inside. That foamy material was ideal for a hanger; I cut it up and fashioned it in a way so that the inside of the hanger had round protrusions (the foamy stuff) that held the hanger onto my dick. With this hanger, blood seemed to be able to flow in and out of my penis easily. This is the only hanger that I’ve ever used that didn’t leave my glans cold. Unfortunately, I hid the hanger in a closet so no one would find it and glue spilled all over it, ruining it. I have no idea what the foamy stuff was and I can’t find it anywhere.
I through the whole contraption away. I think I’m going to order a bib hanger, it was too hard making that one and I don’t want to even try without the foamy stuff. I modified that hanger from the original bib hanger. I made mine so that it was smaller than bib’s and I cut it in half and put a hinge on the side that goes under my penis. On the top, I put a screw on one half and left some of it sticking out of the top. On the other side (still on the top) I screwed a latch that I was able to latch around the screw sticking out on the other side. It was difficult getting the latch and screw to be in the right spot and I couldn’t adjust them without putting another hole on the hanger. A few modifications and I think it would’ve been perfect—especially if I made a way for the hanger to fit on penises with different girths.
At any rate, this one was tailored to my dick and worked perfectly and let blood into my glans. If you can make something that sounds about like that with some kind of firm spongy material on the inside, it may help you. :) But maybe a vet will be able to give you some advice that actually makes sense.
"Only enemies speak the truth; friends and lovers lie endlessly, caught in the web of duty". -Roland, in Stephen King's The Last Gunslinger