Re: IUD or diaphragm
IUDs can cause scarring, cramping and heavy cycles. Not all the time and not for everyone. They are long term and so can be convenient. But not recommended for women who have not yet had a child. I guess if you've not had a child you may be more prone to the type of scarring that could prevent pregnancy.
Diaphram can be inconvenient and you must place them correctly to prevent pregnancy. They must be cleaned, maintained and placed prior to activity so this can possibly prevent spontanaity...But if they are correctly placed, they are very effective and have the benefit of not ingesting hormones.
Its really kind of a lifestyle choice yeah?