Tell him to use the freakin cream! And tell him to KEEP using it for two weeks after his symptoms are gone.
Yes, Jock itch is caused by a fungus... yeast. Jock itch is basically a male-yeast infection and, yes, if he doesn't treat it you can get it. I honestly don't know if it can lead to a bladder infection but I don't see why not.
I tend to get jock itch once a year or so and my symptoms are like your BFs. Raised red areas with occasional mild itching. My wife refuses to do ANYTHING with me until its been gone for at least a week. It can be stubborn.
Ouroborous