My wife had this spiral a few years ago. It seemed to me that this reduced her libido, but not too much. This is what I notice. My wife says that at first she had very heavy periods. I know that for some people this type of contraception causes more serious side effects, so I advise you to read more about this on medical websites such as Canadian Pharmacy Online. You should also consult your gynecologist. As far as I know, the spiral isn't the most reliable form of contraception right now.