Homersexality is a behavior. It is not a race.
Behaviors are complex because God created us complex. There is no one cause.
one of the causes is imprinting:
http://en.wikipedia.org/wiki/Imprinting_(psychology)
It always puzzles me how those who think of people as “born that way” explain suddenly homosexuality upon entering prison. It’s not as if people spontaneously change their race, unless they’re Eddie Murphy with a Hollywood budget. The explanation is, well, that’s different, because there isn’t any alternative. There are alternatives, obviously. But supposey straight men turn gay, anyway. Because apparently the act means more to them than how the sexual object is shaped.
Homosexual behavior is a behavior.
Homosexuality is a condition (same sex attraction, orientation).
Learn the English language. -ity denotes a state or condition or essence, not an act.