These days there are different methods of birth control. All these methods can be divided into four major categories: surgical methods, intrauterine methods, chemical methods and barrier methods. The most well known examples of the first methods' category are tubal ligation for women and vasectomy for men. These are surgical operations which make person unable to procreate. These days these both operations are not reversible. Another technique of birth control is intrauterine methods. And here are two major types of this technique which are widely spread. They are called Intrauterine Devices ("IUD") and Intrauterine System ("IUS"). Different kinds of Intrauterine Devices are very popular in many different countries all over the world. And through the pretty long history of their usage they have proved to be very effective contraceptive devices. Only in the United States of America these methods of birth control are not widely spread because of the 12 deaths that were associated with the use of Intrauterine Devices. Barrier methods are probably the most widely used. The most representative example here is condom. The biggest number of condoms used all over the world is male condoms - due to their properties and relatively low effectiveness female condoms are used not very often. Women use other barrier devices like cervical cap, diaphragm or Lea's shield. These devices are meant to stop sperm from entering the uterus. These devices made of silicone or latex are placed over the cervix. Unlike cervical cap and diaphragm which are available in different sizes Lea's shield does not need that option. It holds safely due to its construction. Talking about female barrier contraceptive, it is necessary to mention contraceptive sponge which absorbs sperm and kills it as long as spermicide is used. But this birth control device is not as popular as diaphragm or lea's shield. Chemical methods are based on the use of special substances that prevent pregnancy. In most cases estrogen together with progesterone or progesterone alone are used for that purpose. Combined oral contraceptives are also known as simply "Oral contraceptive". These are special pills that should be taken daily. Another type of pills that is used today is Progesterone Only Pill (or Progestin Only Pills with synthetic analog of progesterone). Theoretical effectiveness is similar to combined oral contraceptives but in practice they are a little less effective. Among chemical methods there is also so called Lunelle. There is not much lunelle information available and this method is not so widely used as pills. In this method monthly injections of Estradiol are used. Side effects of this method can be more dangerous than those of pills, so it is necessary to find out all the available lunelle information. And this lunelle information will not only help you to find out lunelle method of action - a much more important part of lunelle information is possible lunelle health effects and contraindications.