Which of the following is not the characteristic of an ideal contraceptive?

Irreversible.

The correct answer is Option (3)- Irreversible.

An ideal contraceptive should be user-friendly, easily available, effective and reversible with no or least side-effects.

It also should in no way interfere with the sexual drive, desire and/or the sexual act of the user.

A wide range of contraceptive methods are presently available which could be broadly grouped into the following categories, namely Natural/Traditional, Barrier, IUDs, Oral contraceptives, Injectables, Implants and Surgical methods