I think the statistic that one third of americans do not believe in 
evolution may be explained by lack of procreatory behaviour. See paper 
below.

http://www2.warwick.ac.uk/fac/soc/economics/staff/faculty/oswald/finalsentscanjsex04.pdf

Money, Sex and Happiness: An Empirical Study This paper studies the links 
between income, sexual behavior and reported happiness. It uses recent data 
on a sample of 16,000 adult Americans. The paper finds that sexual activity 
enters strongly positively in happiness equations. Greater income does not 
buy more sex, nor more sexual partners. Married people have more sex than 
those who are single, divorced, widowed or separated. The 
happiness-maximizing number of sexual partners in the previous year is 
calculated to be 1. Highly educated females tend to have fewer sexual 
partners. Homosexuality has no statistically significant effect on 
happiness.

Detailed conclusions include the following: (i) The median American has 
sexual intercourse 2-3 times a month (among people under 40 years of age, 
the median amount of sex is once a week). Approximately 7% of the 
population report having sex at least four times a week.

(ii) A third of American women over the age of 40 report they did not have 
sexual intercourse in the previous year. The figure for men is 15%.

(iii) Homosexual and bisexual people make up 2%-3% of the United States 
population.

(iv) There is some evidence that sex has disproportionately strong effects 
on the happiness of highly educated people.

(v) The happiness-maximizing number of sexual partners in the previous year 
is 1.

(vi) Homosexuality has no statistically significant effects on happiness.

(vii) Married people have more sex than those who are single, divorced, 
widowed, or separated.

(viii) Highly educated females have fewer sexual partners.

(ix) Income has no clear effect. Money buys neither more sexual partners 
nor more sex.


On Aug 13 2006, Dennis Raphael wrote:

>Another indicator of public understanding and receptiveness to "complex"
>concepts. -- dr
>
>"In evolution, Americans are big non-believers"
>
>39% called Darwinism "absolutely false"in the 2005 survey;
>In other countries 80% of adults do believe
>
> < 
> http://www.theglobeandmail.com/servlet/story/RTGAM.20060811.wevolution0811/EmailBNStory/Science/home
>>
>
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