What phenomenon is depicted in the given figure?

What is the function of copper ions in copper-releasing $IUDs$?

Oral contraceptive pills contain

$Statement 1$: Use of condoms is a safeguard against $AIDS$ and sexual diseases besides checking pregnancy.
$Statement 2$: Certain contraceptives are planted under the skin of the upper arm to prevent pregnancy.

Which of the following conditions can help in avoiding fertilization?

Contraceptive method,having least side effect is $:-$