I don't know if this will help, but from what I understand cacti grown in harsh or unnatural conditions produce none, few, or soft spines. The "penis cacti" produces lots of spines when watered a lot and produces very few spines when watered sparingly. 69ron was right on spot.
http://files.shroomery.o...86-the_hulks_dick03.jpg
The only reason to worry about spines is when you are putting your cacti in a contest or growing them for botanical identification. Some cacti "look better" with spines, for decoration or identification. Otherwise cut them off, so they won't poke you.
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