The twin studies definitely show that ‘gayness” is not entirely genetic in nature. But the fact that one in 7 lesbian twins who are gay will have a gay sister indicates to me that there is at least a gay tendency gene floating around in these girls. The rate is somewhat lower for males.
I conclude that since 1 in 7 is well above the normal distribution of lesbians in the population as a whole.
Is this correct? If not, why?
The molestation factor!
If one sister was molested, why not the other?