On Wed, 8 Jun 2005, Jim Devine wrote:
> rather, it's possible (likely) that twins share much of the same
> environment. Both of them could have learned how to attain orgasm
> better.
We're comparing fraternal twins (same age, growing up in the same family environment) to identical twins (same age, growing up in the same family environment). Your argument doesn't easily explain why fraternal and identical twins differ on this trait.
Miles