I've also read the study (and ALSO can't find mention of it now) about rats in a controlled area with varying populations and the correlative variance of homosexuality. I keep hearing people talking about genes as though they're a light switch. Either ON or OFF. That's not how ALL genes work. Some genes can be affected by "coactivation" (A coactivator is a protein that increases gene expression by binding to an activator) I've read (but now can't find, darn-it-all) that it's the MOTHER that determines the sexuality. That stressors during pregnancy affect levels of a type of testosterone that would then "turn on" the expression of homosexuality. If the mother has the gene for this AND she is under stress during the exact part of her pregnancy for this to have an effect, then the child will be gay. Thus, not ALL children from her will be gay, and even in the case of identical twins, it might not be enough of an effect for both to be affected. Population control is the only logical explanation thus far put forth for the existence of homosexuality. It's obviously a survival trait that Mother Nature has so thoughtfully provided. It's really too sad that we'd rather use superstition and religious delusion to explain the real world than to open our minds (and our hearts) and realize that homosexuality is a NATURAL part of life on Earth. No one chooses to be gay. No one chooses to be straight. It just IS, and for the betterment of all mankind! (especially in this day and age when most of our problems like pollution, wars, famine, global warming, etc are caused by overpopulation)