Homosexuality and hetrosexuality are both natural. Most people are heterosexual, a minority are homosexual, some people are bisexual and a small number of people have no sexual interest at all. I think these are all natural conditions – whether it’s as a result of the way people are born or the what they encounter in their life, I don’t know, but it’s probably a combination of the two.
You can compare it to whether it’s natural to be an agressive, energetic adrenalin junkie living on their nerves or a laid -back lazy person who just wants a queit life – again, both types are natural.