Choosing the right size condom is essential for both comfort and effectiveness. A condom that is too small can be uncomfortable and may break, while a condom that is too large can slip off during intercourse. To choose the right size condom, you need to measure the circumference of your erect penis. You can do this by wrapping a piece of string or dental floss around the base of your penis, and then measuring the length of the string or floss.
Once you have measured the circumference of your penis, you can use a condom size chart to find the right size condom for you. Condom size charts are available online and in most pharmacies. If you are not sure what size condom to choose, you can ask your doctor or pharmacist for help.