Suggest Methods Of Contraception

siram 36 i have twins boys hav11years.its my second marriage we dont need children now. i want good birth control like copper t but which one is good and which time to insert?need 3years ga only.its fully safely for intercourse?if copper t is not suit for me what will i do for birth control?am in kerala so dont know the best precaution,want to know from your side

shoba