To know; a copper IUD (quite different from a hormone based iud) has the same failure rate as a tubal ligation, but doesn't have any of the side effects of a tubal (for decades male doctors said that the rage/mood swings, odor issues, constant pms'ing, lack of sex drive, fatigue, and a whole host of other "side effects" women who had tubals complained of were 'in their head' / 'just part of being a woman' / etc. Well, low and behold, all those symptoms disappear at menopause, and as more female OBs have come onto the scene the "imaginary" side effects of tubals are actually being studied, and preliminary results are showing that they are very real, and last until menopause or until a reversal is possible. Final results are several years coming, but it's something that women considering tubal ligations should be aware of.)