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(Image: E4)

E4 left viewers feeling utterly disgusted after one of its patients admitted that he hadn’t washed his penis properly in almost 25 years!

The Sex Clinic played host to a man called Zach who popped in to have his manhood checked out.

Zach admitted that he was getting a rather unpleasant smell emitting from his penis,

(Image: E4)

Medical expert Doctor Naomi took a look at the area and explained that the build up on the tip of his willy was known as “smegma”.

The reason for the aggressive buildup of smegma was due to the fact that Zach, 24, had never actually pulled back his foreskin and cleaned the penis properly.

Also adding to young Zach’s woes was the fact that he had previously caught gonorrhoea and the clap.

He had been suffering severe pains for the past nine months and was no longer able to retract his foreskin.

(Image: E4)

Dr Naomi advised that the way to help Zach was actually quite simple, and all he’d need to do would be to clean area.

However, the troubled young man admitted, shocking viewers: "I’ve never cleaned my foreskin before.”

Zach’s lack of cleanliness left viewers disturbed and one person tweeted: "If you can't wash your own bits then you are just looking for trouble".

Another added: “I am genuinely shocked at how little these people know about sexual health!”

"This poor lad on The Sex Clinic has just been told his willy basically needs a good wash”, said a third.

The Sex Clinic continues on E4 at 10pm on Monday.