As far back as 1350 BC, there are records of Egyptian men wearing sheaths as decorative covers for their penises. In the eighteenth century, condom use became popular for protection against infections and unwanted pregnancies. Other condoms made of lamb intestines are more expensive and may not protect as well against sexually transmitted diseases. Condoms are designed to keep semen from getting into the woman's vagina. To maximize the protective benefits of condoms, they must be used correctly.
Condoms usually come rolled up in a package.
The closed end often has a nipple reservoir that catches semen and helps prevent the condom from breaking. Because of this, only abstinence is completely effective at preventing STDs. This pinched-off space will be where the ejaculate collects and minimizes the risk of bursting the condom. The condom must be unrolled onto the erection before any intercourse occurs as it is common to leak a small amount of semen from the stimulated penis prior to ejaculation. If you are not using a lubricated condom, you should put K-Y Jelly or a spermicide onto the condom once it has been placed on the erection to lubricate and hence minimize the risk of tearing the condom during sexual relations.