Final answer:
The diaphragm, male c`ondom, and female condom prevent pregnancy by physically blocking sperm from entering the uterus. They act as barriers that prevent sperm from reaching the egg. These methods are also effective in preventing the spread of sexually transmitted infections.
Step-by-step explanation:
The diaphragm, male c`ondom, and female condom are all barrier methods of contraception that prevent pregnancy by physically blocking sperm from entering the uterus.
- Diaphragm: A diaphragm is a dome-shaped silicone cup that is inserted into the vagina and placed over the cervix before sexual intercourse. It acts as a barrier, preventing sperm from entering the uterus. The diaphragm should be used with a spermicide to increase its effectiveness. It must be left in place for at least six hours after intercourse.