"Parents should realize that most of the scientific community believes that sexual orientation is genetic and that being gay is not a choice," says Carlat. "Stigmatizing someone for being gay is like criticizing them for having brown hair. It is really a relic of another era." - Source.
There is absolutely no scientific evidence one's sexual desires are genetic; none zero zip! It is the opinion of some scientists, the same kind of non-scientific opinions that claim a molecule to man theory, and then call it a fact. I would contend that both evolution and sexual orientation are much more about Philosophies, than science; and furthermore, as Dr. Robert Gagnon argues
…an appeal to a biologically based orientation is not a moral argument. As two researchers who have worked hard to demonstrate congenital influences on homosexual development have admitted: "No clear conclusions about the morality of a behavior can be made from the mere fact of biological causation, because all behavior is biologically caused" (Brian S. Mustanski and J. Michael Bailey, "A therapist's guide to the genetics of human sexual orientation," Sexual and Relationship Therapy 18:4 : 432).
The term "sexual orientation" may sound authoritative enough, but is it?
“The concept of sexual orientation was an intentional and quite successful attempt to redefine the debate over homosexuality from same-gender sexual acts to homosexual identity–that is, from what homosexuals do to who homosexuals are.
Yet this concept is actually of quite recent vintage. In fact, even within the past decade, the concept more commonly employed by the homosexual movement was sexual preference. The reason for the shift is clear: “Preference” implied a voluntary choice, so the clinical category of “orientation” was more useful in public arguments.” - Dr. Albert Mohler
Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God. And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God. 1 Cor 6:9-11 NIV
If we would start telling our young folks what Christ has done for them, and stop encouraging a anti-Christ "truth" - we would do well.