Around the Clock

One inch not too likely
Two's just a little more
Three's becoming usable
Four starts keeping score
Five's beginning average
Six is just above
Seven's more than just a few
Eight's for cautious love
Nine is on the porno size
Ten's to brag about
Eleven wins most contests
Twelve has horsey clout

Around the clock we've traveled
From the smallest to the most
All of them are functional
The larger ones may boast

Most of them can do the job
For a satisfying ride
Average ones ,when used with skill,
Will feel the best inside

There are larger measurements
That are off the clock that's here
For showing off and betting
Winning money or some beer