Level 1: How to use condoms Using condoms during sexual intercourse is a common method of contraception. Proper use of condoms can effectively prevent unwanted pregnancy and the spread of sexually transmitted diseases. The first thing to note is that it is very important to choose the right condom size. Too big or too small may cause it to break or fall off. Secondly, you need to check whether it is damaged or expired and whether it is unfolded correctly before use. Finally, condoms should be removed immediately after sex and disposed of correctly. Level 2: Causes of Condom Failure Although condoms can effectively prevent pregnancy when used correctly,