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Yes! Menstrual cramps are caused by parasites. Here is some research done on infertility in relation to menstrual problems -

Hulda Regehr Clark, Ph.D.,N.D. ' The Cure For All Diseases ' (from pages
108, 109 and 110)
"Many woman's dreams have been shattered by her inability to have a
child. Endometriosis is often the cause. It starts with painful cramps
at period times. They get worse and worse until pain killers are
necessary just to get out of bed and move about the house! There are
flukes in the uterus! Large intestinal flukes in a rather small organ!
Did they migrate to the uterus from the intestine or did they develope
there from eggs?
Sometimes sheep liver fluke is seen there. Once an avenue to the uterus
is established, numerous other parasites move in the same direction:
Clonorchis, the human liver fluke and even Eurytrema, the pancreatic
fluke, can invade the uterus wall. Why have they taken up so abnormal a
living place? Because the uterus has solvents in it!...
Where there are large parasites, smaller ones soon crowd in. All bring
there own bacteria and viruses. Gardnerella, especially, is found in
cases of endometrioses, ovarian cysts and menstrual problems. The
flukes evidently travel from the uterus to other parts of the body
cavety, distributing bits of the uterine lining as they go. Once the
distribution has occered, can the bleeding (regular menstral bleeding)
at these extra sites ever be stopped? It stops immediately when the
flukes are dead!...
Your body knows how to clean up after dead flukes and does it's job
perfectly. You can be free from pain in time for your next period.
Zap to kill the four common flukes, Garderella, all other common
parasites, and urinary tract bacteria (common ones include Proteus,
Salmonella, Campylobactor, Chlamydia, Trichomonas). Aviod reinfection
by avioding solvent!... "

It is true. You must get rid of these parasites in order to stop contracting during menstration. You can read more info at http://www.drclark.net and you can buy an inexpensive Zapper at http://www.zapperplans.com ($10). Read my post in Body Electronics!

Hope this helps ya!