Back to my topic for some answers,
I recognize straigt as NORMAL cuz that is accepted by MOST of the people, look at the poll results.
Here is an example (in carlo's favor

)
Lets say the year is 2347 and the %90 of world population is GAY or LEZ, that means the "Straight" geneology is somehow pulling back againts Gays (Organized gays continually killing straights for example

). The people won't have sex to breed but use artificial methods for having children. The evolution cycle of the nature imediately switches the choice in the gay's favor. This time GAY is normal, Straight is anomaly! Because GAY lives, and straight dies!
That's called evolution, survival of the fittest.
And YES, there ARE homosexual animals, dolphins for example, there are some gay dolphins! Which proves that communicating, semi or full intelligent creatures differ too. Manking is not the ONLY creature that thinks....