Re mooncups.
I have used them in the past, but recently my niece has been advised against them ; she has recently been diagnosed with endometriosis -a condition where uterine lining cells find their way into other places within the abdominal cavity, could find themselves attached to kidney, bladder or bowel, where they also undergo a regular monthly bleed causing extreme discomfort.
The theory is that mooncups and tampons for that matter cause an upward pressure to the uterus, allowing a small amount of menstrual flow ( sorry guys) to back up the Fallopian tubes and freely spill out into the abdominal cavity. The blood flow will always contain some living cells from the uterine surface, which may adhere and grow on the surface of other organs.
My own experience is that mooncups can be useful for those intimate moments, and tampons for swimming, but anyone thought of using washable pads?
http://www.thefword.org.uk/reviews/2003/05/moon_mammas_fleece_menstrual_pads