I have a very large Mushroom head that is much larger than the shaft. I have had quite a few women mention it and tell me in feels really good sliding between their vagina lips. I really enjoyed it when the gave me a blowjob or a great handjob.
So what circumference makes one fit the definition of being a mushroom cock? lol…yet another reason to play with my dick and start measuring!
I might refer you to another comment before on the qualification of being a "Mushroom Cock" ChicagoNudist54