Just read this:
Pineapple, mango, and kiwi contain en enzyme called bromelain that is supposed to work like a prostaglandin, ripening and softening the cervix. That enzyme is not present in canned pineapple, so you'll have to eat it fresh.
I was wondering why, well I have a 4 pack of ready to eat ripe kiwis down stairs. Am I pushing it of I eat them too?????