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How to make your penis larger and longer?

Lotions and pills is completely waste of money as there is no evidence or studies that proved their effect of penis length or its size.
Exercise and stretching penis might be helpful on long time run but also not documented.
Penis pumps and it's a temporary way to enlarge your penis.
Suspensory ligament surgery.
Liposuction and cosmetic elongation.
Lose weight help feeling a large penis.

Is there any relation between sexual intercourse and size of penis?

No the normal penis size range from 10 to 15 cm and it's enough to cause sexual excitement and pleasure to both wife and husband.

What are the causes of penis shrinkage?

Aging
Obesity
Prostate surgery
Peyronies diseases
Drugs and alcohol
Smoking

What is the treatment of such condition?

Life style modification
Healthy food
Healthy drinks
Stay physically fit
Lose weight
Stop smoking
Do not take any drugs unless prescribed
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Warm Regard
khaled jaber

you are welcome, please let me know if you need anything else.

How to preform jelqing massage?
First your organ must be erect and then begin to warm your penis with a hot bath or shower then take a little oil on your hands and rub it all over your penis then hold your penis at the base with your hand to form ok sign then gently squeeze your penis down its length then change hands and so on .
You will need to preform 200 times a day for 6 months to get a result.

yes you can use any kind of lubricant.

you are welcome, please let me know if you need anything else.