The hormones involved in sperm production are the luteinizing (which activates the secretion of testosterone) and FSH. For more information see this site: Robert Greene. The latter, artificially administered with a steroid, inhibits gamete production. But man, this can temporarily prevent fertility is more complicated than in women because sperm production is continuous, without being subject to periods or cycles. Some studies showing a very high effectiveness, although not yet have final numbers. Some say that in most cases do not reach the a-zoospermia, ie the total absence of sperm, which can fail contraception.
Moreover, this method is less comfortable than the "pill" feminine, because its presentation is injected, and in some cases men resist puncture pain and possible eczema. Also called prophylactic or condom condom or "rubber bands", have increased their level of acceptance and use after having verified that help prevent transmission of HIV (AIDS) and other sexually transmitted diseases. They are placed over the penis during intercourse, and are made of latex, although testing the polyurethane condom manufacturing, as it is thinner and allows for greater sensitivity. At the same time, has greater resistance and therefore greater security. It is also very convenient for people allergic to latex. The effectiveness of condoms is very high compared with other methods, provided that there are some good use measures: check the expiration date or expiration do not use two condoms overlapping and that increases the chance of breakage no exposing them to a heat source Do not mix with petroleum based lubricants such as Vaseline use from the beginning to the end of the relationship, one from each sex take care that no air in the upper reservoir of out with caution so as not to spill semen. Some of the advantages of condoms have nothing to do with its effectiveness, but become a common method of choice: are acquired easily and cheaply in pharmacies and markets, are easy to use and require no prescription care. Its contraceptive effectiveness is enhanced when used in combination with spermicides, so some presentations of the market and containing such substances in the lubrication of the product.
Sterilization is a permanent surgical method, which in men is called vasectomy, an operation that interrupts the tubes that carry sperm from the testicles to the penis. The role of orgasm and ejaculation are not disrupted, but no sperm in the semen. Many men fear that after vasectomy sexual potency is concerned, but the hormonal function remains intact. These operations do not decrease sexual pleasure, but rarely are reversible, so it must be decided very thoroughly. Article by