Removal of gonads cannot be considered as a contraceptive option. Why?

Contraceptive devices are used to prevent unwanted pregnancy and to prevent the spreading of $STDs$. There are many methods, such as natural, barrier, oral, and surgical methods, that prevent unwanted pregnancy. However, the complete removal of gonads cannot be a contraceptive option because it will lead to infertility and unavailability of certain hormones that are required for normal functioning of accessory reproductive parts. Therefore, only those contraceptive methods can be used that prevent the chances of fertilization rather than making the person infertile forever.