A condom is a rubber or latex covering worn over an erect penis while having sexual intercourse. It is a very common form a contraceptive method used from the nineteenth century. Condoms are worn so that they prevent sexually transmitted diseases to spread from an infected person to uninfected person. They also prevent pregnancy. They physically block the semen to pass from the penis to the vagina. If you have enough trust on your partner then you could not use a condom, but when sexually contacting with an unknown person you have to use a condom. People allergic with latex condoms who suffer irritation due to their use can find some substitute contraceptive method. If you are ready to become a parent and have previously indulged in sex with your partner or have faith on your partner you could not use a condom. A condom used with proper knowledge will prevent the spread of sexually transmitted diseases. A person could not consider using a condom if that person would want to take the risk for not using them, as there could be some serious consequences for not using one. An uninfected person could get infected with some serious sexual diseases by not using a condom.