Does the average man read less than the average woman?
Yes. Women read quite a bit more than men do, according to an article from NPR (see Related Links).
Do most deserts receive on average less than 50 inches of rain less than 10 inches of rain or less than 1 inch of rain each year?
Can you explain why the average woman should eat 2000 calories per day while the average man should eat 2500 calories per day?
If you mean average length of the penis in a 14-year-old, it would be shorter and less developed than in an adult male. The average length for adults is 5.57 inches erect. You will have to wait to see to see if yours will be that size as an adult. That said, 3 inches is more than large enough to have intercourse with an adult woman.
"Less" typically means "minus," thus calling for subtraction. As an example, "Forty less twenty nine" might be read 40-29. "Less than," by contrast, might also be read "smaller than." In other words, if a problem were to ask for a number less than 9, a possible solution would be any number smaller in amount than 9 (the numbers 1 through 8 for example).