they come in like large and x-large but i donno what size i need to get... just wonderingin there is a metric condom sizeing chart lol
Three times a day keeps the doctor away (if you know what i mean <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />)
The size condom you need depends on your girth - the circumference of the shaft of your penis - and not the length. All condoms are made considerably longer than the average penis, with the expectation that nearly everyone will just not unroll them fully. The larger ones are wider, but only slightly longer.
To measure your girth, use a cloth tape measure around your (erect) shaft, about in the middle, and see where it comes back to itself. If you don't have access to a cloth tape measure you can use a strip of paper or a piece of string and mark on it where it comes back to itself, then straighten it and measure with a ruler.
It depends a bit on the brand and style, so you will need to do some experimenting before you need to use one. That's a good idea anyway, so you know how to put them on. Usually a regular condom should be fine if your girth is in the range 11 cm to 14 cm. Below 11 cm you might try the slimmer ones; above 14 cm you might find the large ones fit more comfortably. If you are 16 cm or more around you will probably want extra-large.
Don't take these numbers as gospel, though - see what's best for you. A condom should fit tightly so there is no chance of coming off, but it should not be so tight that it's difficult to keep hard.