Wrap the used condom in a tissue and throw it in the trash where others won't handle it. Because condoms may cause problems in sewers, don't flush them down the toilet. Afterwards, wash your hands with soap and water. They can affect your judgement, so you may forget to use a condom. They may even affect your ability to use a condom properly.
Condoms can be very effective at preventing pregnancy when used consistently and correctly.
When condoms are used along with a vaginal spermicide, effectiveness rates increase significantly. It is a barrier method that can help prevent transmission of STD's. The cost varies, but is low in comparison to many other products. Males can actively participate in this method of birth control. Some partners do not like the discharge of semen, and find this an aesthetic way of dealing with it.