safe or not

I am a 20 year old male, who is confident and sexually satified and have been for years. i have never had any problems satifying a women, however, i have a 6 inch penis, and i was wondering if there was any safe and permanent way of getting an extra inch or so. for ex. are drugs like extenze, zenerx, avela safe, and if they do increase will that cause a less firm erection? should i try one of them?

[Dalubaba]

Six inch length is enough to satisfy any women. woman's vagina is sensitive up to inch es depth only. Erect two inch length penis is also able to satisfy any woman. however if you are prepared to do the exercise, you may visit www.pegym.com.Also visit kegel exercises.
You may also visit Tantric yoga.They have given methods to prolong intercourse. Kundlini yoga also gives techniques for healthy sex.Toaist yoga also is good website.
For medicine you will have to go to your health care people.to get the habit of drugs at this age is not advisable.