Quote Originally Posted by Anixx View Post
Actually if you look at the ages of sexually active men and women you can see the following.
The sexual activity of men as about 14-70, sexual activity of women is about 14-40.
The problem here is that men have peak of sexual activity at the age of 18 but women at the age of 28, so, first - it confronts you theory completely and second studies show that most of men active at 20s and 50s and significantly less active at 40s, 30s, 60s, and 70s (in this order)
Quote Originally Posted by Anixx View Post
So for each sexually active woman there are about 2 sexually active men. This creates a
strict deficit of sexually active women.
I guess you only good in simple math, something a little bit more complex didn't cross your mind
Have you considered that number of man and women living on this planet is not the same and also did you look into the life expectancy?
http://ru.wikipedia.org/wiki/Соотношение_полов

Anyway
If we talk about the US
Here is the statistics - http://www.infoplease.com/ipa/A0005061.html
The difference is about two years, I don't think it's very significant, I also think that this difference covers differentiation of puberty of males and females. Please also notice that age of 18 is not median for the marriage in the US
And Russia is very close to the US - http://en.wikipedia.org/wiki/Age_at_first_marriage

Also population in the US - 49.2% males and 50.8% females
http://www.infoplease.com/ipa/A0004925.html


There is another thing that you didn't think of. Age 21-25 is considered the completion of development of brain's frontal lobes. Frontal lobes are very important and they basically separate children from adults.
"The executive functions of the frontal lobes involve the ability to recognize future consequences resulting from current actions, to choose between good and bad actions (or better and best), override and suppress unacceptable social responses, and determine similarities and differences between things or events. Therefore, it is involved in higher mental functions." - http://en.wikipedia.org/wiki/Frontal_lobe
By that age people should understand what marriage is and start searching for a partner