Introduction Throughout the world at least 100 million women use intrauterine contraceptive devices (known as ‘coils’). This makes the coil the most commonly used form of contraception. This site contains information on Flexi-T, the woman-friendly coil-IUD. It will tell you how it works, what its advantages are, and why this IUD (Intra-Uterine Device) is also suitable for women who have never had children. Flexi-T is a very reliable contraceptive method which is already being used by one million satisfied women.