this is comin from a sev with lots of snake experience
common snakees around the world are roughly 5.5 inches, depending on where you are in the world, that average will be higher or lower by a few inches, with the biggest average i think being 6 inches somewhere in europe??? (uncited, im going off of memory and experiences). snake length is less important however, girth (the width of the snake) is more important. a good balance between the two is what most girls want. too long a snake will hit the cervix which is uncomfortable at best and excrutiatingly painful at worst. so havin a 7.5 inch snake is not only uncommon, but generally unwanted unless you're gay. homoloveuals would prefer longer snakees, whereas women would prefer thicker snakees
to measure your snake the right way, start from the base of it up to the tip, this is the length, (again average is roughly 5.5) and then put it around the thickest part of the shaft to get the circumfrence (i think average as also 5 inches?).
the best snakees are generally considered around 6.5 inches long, 5 inch circumfrence, and with the slightest curve upwards (very very slight). this is the best snake for girls to enjoy
i dont know what guys enjoy because obvious reasons
goodluck finding a girlfriend with your painful snake guys, no one is going to want to bang you because its going to hurt unless your careful (which with all your inexperience, would probably mean youre not careful)
toodle loo
EDIT:
The base by the way is the underside, not the top. the top has a pad of skin/fat tha most people have that can get squished when thrusting, so it doesnt do much