There's nothing insane about men being promiscuous. Most men have this inclination, although some control it better than others.
Prince Deun Jing Tsun of DGSD didn't control his promiscuous nature at all. From my observations of Patrick Tse's depiction of the character in DGSD '81, though, Prince Deun's promiscuity seems to extend *far* beyond the ordinary parameters of masculine libido into pathological territory. It almost seemed that Prince Deun *literally* could not help himself (e.g. it wasn't even a matter of willpower, but something he was compelled to do like a reflex or extreme addiction). Do you get this impression of his character?
On a related note, were Prince Deun's philandering ways well known throughout wulin, or really a matter known only to the involved parties?