What works better: a diaphragm or an IUD?

An IUD is more reliable than a diaphragm. Effectiveness of the diaphragm varies with the user. If a girl is well trained to use it reliability is 95%. But in practise 18 out of every 100 women who use it become pregnant after a year. So it’s not very safe. A big advantage is that you only use it when you have sex. It’s a good choice if you use condoms as well. An IUD is reliable if you check monthly to see if it is still in place. The big advantage is that you don’t have to think about it when you want to make love. But with some women periods become heavier, longer and more painful. So if you already have painful periods an IUD is not a good choice. Mind you that both an IUD and a diaphragm don’t protect you against STD’s. So if you or your lover ever had unsafe sex, you better use condoms as well.

See also: reliability of contraceptives