forever, non of these pills and potions work
It depends on how you use it.
The lenght of the penis doesn't matter as long as you'll get sperm in your vagina.
Its about average size.
Average adult is 6 to 7 inches.
cuz you have a pin
Not to sound rude but i highly doubt that u have an 18" penis
ExtenZe is a nutritional supplement for which it's manufacturer makes the claim to "enhance" the male "anatomy". While the infomercials and advertisements never say it outright, it is obvious they are making the claim to enlarge the penis. The manufacturer offers many testimonials, (always suspect when somebody has something to sell you) but no solid, peer-reviewed, scientific studies that show any measurable results whatsoever. Save your money and don't obsess about the size of your penis. As long as it functions and brings you pleasure, it's the perfect size for you.
It is average adult size.
That's good. the average penis length is about 5-6 inches, so you're good.
Of course you can. as long as you have active sperm.
3.5 inch
The average ADULT'S penis size is anywhere from 4.4 inch to about 6.5. 5 is in the middle, and pretty common. Don't stress over it to much :)