Blocking the vas deferens in males prevents the transfer of sperm, while blocking the fallopian tube in females prevents the egg from reaching the uterus. In both cases, fertilization is prevented, offering a method of contraception.

Intrauterine contraceptive devices, such as the loop or copper-T, may cause side effects due to irritation of the uterus. Understanding these potential side effects is crucial for individuals considering the use of such devices.

Examples of contraceptive devices mentioned include the loop or copper-T, which are placed in the uterus to prevent pregnancy. These devices work by creating a barrier or inducing conditions that impede the process of fertilization.

Hormonal contraceptives, while effective, can cause side effects due to their impact on the hormonal balance of the body. This underscores the importance of understanding potential consequences and consulting healthcare professionals when considering such methods.

The second category of contraceptives works by changing the hormonal balance of the body, preventing the release of eggs and fertilization. An example is oral contraceptive pills, commonly taken to avoid pregnancy.