The causes are mostly complex and sometimes difficult to ascertain as they can be collectively due to various factors like;
2) 5 HT dysfunction
3) Hyperexcitable ejaculation or hyperarousability
4) Penis hypersensitivity
5) Poor ejaculatory control
6) Infrequent sex
8) Performance stress
One or many factors can play role simultaneously. Urologist's assessment would be able to give the clue and then are dealt appropriately.
Following measures are helpful for premature ejaculation;
1) Application of lidocaine on glans about 20-30 minutes before the intercourse.
2) Learning of squeeze technique; your physician or urologist can give counsel about this (you learn to squeeze the erect penile shaft before the ejaculatory reflex is stimulated; see the resource also)
3) Medical therapy;
a) clomipramine, phenoxybenzamine are the medication which can be helpful to you.
b) Numerous studies have shown that selective serotonin reuptake inhibitors (SSRIs) and drugs with SSRI-like side effects are safe and effective to treat premature ejaculation. So you need to get the prescription of any of the following medications;
The other way suggested is the masturbate 3-4 hours before the sex. The ejaculation is significantly delayed than with the sexual act, if you get an erection in 3-4 hours.
4) Female up position; this delays the ejaculation
5) Avoidance of stress: performance stress, again increases the premature ejaculation and aggravate the situation.
6) Talk to your physician about the problem in the presence of your spouse and together this can be easily handled.
7) Sex therapy sessions.
Read this resource; http://www.mayoclinic.com/health/premature-ejaculation/DS00578
For the erectile dysfunction, your doctor can prescribe you Viagra, Levitra or Cialis. An herb called Yohimbe too can help, which is available at health stores.
The length of penis has only cosmetic importance. Functionally length is not important for the satisfaction of the factor. Only surgery can increase the size of penis. Please read these resources for penis size;
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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