Modifies a noun

• dysfunction: Most had a history of erectile dysfunction of over a year.

• impotence: The role of yohimbine for the treatment of erectile impotence.

• tissue: Damage to the blood vessels will also prevent the erectile tissues from filling with blood.

• function: Of the men taking part in the exercises: 40 per cent regained normal erectile function.

• drug: One in 10 men in the UK could benefit from erectile dysfunction drugs to help erection problems.

• difficulty: In fact, the study suggests that about 18 million American men are affected by erectile difficulties.