Medical Question: Bleeding out from removal of a "certain organ."

[were_lemur]

I'm trying to figure out how long it would take a man to bleed out from having his penis bitten off. My googling has turned up plenty about reattatchment, and has confirmed that death will be from blood loss, but I haven't been able to turn up the actual timeframe.

Assume the bite-ee is aroused at the time of the bite, and that there is no medical attention handy.