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To be fair, just because there is no single specific gene does not mean that there isn’t a genetic basis for the phenotype.

There is no “black” gene or “Asian” gene or “Jewish” gene, but a child is clearly born black or Asian or Jewish. Rather than a single gene controlling the phenotype (such as with eye color), the genetic basis for ethnicity is a collection of genes that occur with varying degrees of frequency within a demographic.

Likewise, it’s very unlikely that there would be a single gene that would render a child homosexual, but varying combinations of genes could still theoretically predispose a child one way or the other. For example, there are several genes apiece that control the releases of hormones such as testosterone, estrogen, oxytocin, vasopresin, and other hormones that are generally sex-differentiated. Having unusually high or low levels of such hormones could cause sex-role-anomalous behavior.

For example, low testosterone combined with a very sensitive amygdala could make a boy instinctively scared of aggression displays; his fight-or-flight response would prompt him to flee rather than fight, and as such he probably would develop a dislike for toy weapons or sports. He’d be more likely to entertain non-threatening hobbies like arts-and-crafts or musical theater, where these gay predispositions would be socially reinforced.

Go to Pfox’s site and you’ll see many thousands have changed from a “homosexual” lifestyle to a Heterosexual lifestyle. If there was a “gay gene” there would be no chance of being gay then straight! People are pre-disposed to all sorts of “battles” in their life. Gosh, I struggle with “worry”, does that mean I was born that way? My buddy struggles with womanizing...can he explain to his wife that he was born that way? Now we are justified in our actions? Now kids have to accept worry and womanizing and learn in school that it’s their right to act like that? Make sense? Come on, we all have our “secrets” we need to battle and this “anything goes mentality is total BS. People there are rules, etc or societies social and moral fabric will suffer!! Look it up...every country that falls loses all morals and values.

For the most part, the ex-gays I have spoke to all have similar stories of sexual or verbal abuse. Loneliness, despair and hopelessness drove them to homosexuality.

You are correct about there being no one “gene” for being “black” or “asian” in appearance. Children who have a black parent and a white parent can display physical characteristics along a continuum between the parents.

This is an interesting article on the subject of whether there is a “gay” gene.
“Bocklandt has collected DNA from two groups of 15 pairs of identical twins. In one group, both twins are gay. In the second, one twin is gay, and the other is straight. Identical twins have the same DNA, but the activity of their genes isn’t necessarily the same. The reason is something called methylation.

“Methylation turns off certain sections of genetic code. So even though we inherit two copies of every gene—one from our mother, one from our father—whether the gene is methylated often determines which of the two genes will be turned on. Methylation is inherited, just as DNA is. But unlike DNA, which has an enzyme that proofreads both the original and the copy to minimize errors, methylation has no built-in checks. It can change from one generation to the next and may be influenced by diet or environment.”
http://discovermagazine.com/2007/jun/born-gay

Then there is also a theory that exposure to hormones in the womb influences sexual orientation.

Your last paragraph deals with predispositions to activitivies, not the issue of attraction to certain types of sex.

It would be remarkable to find that there was any genetic predisposition to want to put a penis in an anus rather than a vagina.

Two guys loving each other is just two guys having love for one another. I can see any male having the ability to “fall in love”, meaning to develop a loving, nurturing relationship, with any other human being, whether they are male or female.

But “homosexuality” is simply about what parts you use to satisfy sexual urges.

Which is why heterosexual men have “gay sex” in prison — the gay rights activists aren’t stupid enough to suggest that most criminals are gay men, so they have to admit that “gay sex” has nothing to do with inate attractiveness to other humans.

And it is also why a man can be sexually attracted to another man if that other man simply puts on a wig and pretends to be female. If sexual attraction was built into genes and was hormonal, the male heterosexual would inately be able to tell that the person they were with was not of the sex they were attracted to.

But in fact, sexual attraction is largely about desiring sexual gratification, and years of training in what is supposed to be “sexually attractive”.

So if you grow up in a society where women hide their faces, you get aroused by seeing a face. Grow up nudist, and your arousal is built on some other factor. Grow up being told that other men are attractive, you will find other men attractive. If society teaches that heavy women are desirable, people will want to have sex with heavy women, if we say that thin girls are the thing, people go after thin girls.

We allow homosexual activists to steal the argument when they mix raw physical sexual urges with the concept of love and relationships.