It's a learned bigoted reaction that can be unlearned.
It's a natural reaction.
Not enough is known about it to explain it.
Other (please elaborate)
"A woman is like a teabag, you never know how strong she is until she gets in hot water." - Eleanor Roosevelt
Keep your religion out of other people's marriages.
I read somewhere that when you don't ask the question suggestively, by only providing an "either/or" choice, but rather ask people "on a scale from 0 (hetero) to 100 (homo), where would you place yourself?", then by far most people don't chose either extreme, but somewhere in the middle.
And other cultures/past European cultures defined "love" differently than we do today. Loving affection between members of the same sex was acceptable under certain cultural conditions, even if sex was not necessarily acceptable.
So I believe most of it is culturally conditioned, even if most people probably have a natural tendency towards a particular sex.
"Not learning from mistakes is worse than committing mistakes. When you don't allow yourself to make mistakes, it is hard to be tolerant of others and it does not allow even God to be merciful."
So, this guy:
should have been punished for a public display of affection? He was in uniform, after all.
Can't we just turn Congress off and then turn it back on again?