Astlin said:
IMO yes.
A Monk with 5 attacks using unarmed strilke is still only using one natural weapon. Eight body parts are mentioned in the PH, but they are all used interchangably without benefit or restriction. If I wanted to attack my opponent five times with my left elbow, there is nothing in the rules that would prevent it.
A Dragon with Claw/Claw/Bite/Tail/Wing attacks is using five natural weapons. They are listed as seperate weapons.
A non-monk using both fists is using two natural weapons.
Astlin
A monk can make their normal iterative attacks using only a single fist/foot/elbow/etc., but if they choose to use Flurry of Blows, the extra attack has to be made with a seperate limb.
If they have Magic Fang cast on them, only one natural weapon is affected, but they can use that weapon for all their normal attacks. It would have to be cast on them a second time to affect the extra attack from Flurry of Blows.