Homosexuality

[Abaddon_ire]

First of all, this does not explain the romantic aspects of homosexuality. Homosexuality isn't just about sex, you know. Many homosexuals love the person they are with, and the feelings they share with their partner are the same feelings two heterosexual lovers feel towards each other. If you do not believe that the love is real, then I'm sorry, but you are ignoring a huge part of all of this, because the feelings are real. 
Also, another problem with your theory is that homosexuals exist in all kinds of different environments and societies(Even if some people never come out of the closet, I am telling you they are there). Sure, this fact doesn't disprove your claim, it does however show how small the cause would have to be if it was social though, as you would have to have something very similar in all cultures that is the cause. It would be very hard to figure out what that cause is, since it would be so un-obvious. 
3rd, the percentage of the population that is LGBT is quite small. 3%-5%. If homosexuality was a product of something in society, wouldn't, like, almost everyone in a society with that cause be gay? Since every person in a society is exposed to society, they are exposed to this undetectable cause. So why is such a small percentage of the population LGBT? Is this small percentage just sensitive to it or something? If that's the case, then they were born being sensitive to it. And we are back to the point of us being born with something.

I believe the trigger is the hormones and the submission to their effect; then the mind works in that frame, with a choice to how to manage the submission to the hormones.

Explaining this more: we seek mates because our hormones push us. Just like animals in the mating season.
Then; our human mind writes how we should quench the need of the hormone. Some go date, others just have sex, others love and seek a romantic relationship.

All I can say that it's about the mind more than anything; it's about who you choose to be in the most part.

I consider homosexuality to be "in a small percentage" because the culture backfires.
Every trait the culture forces on its population might work for 90% or 95% of the population; but backfires with 5% or 10%: doesn't work probably.

That's why two brothers or sisters in the same house, might grow to be doctors or serial killers. What worked for one, didn't work for the other.

Is this small percentage just sensitive to it or something?

I think yes. Just like people with Hypersexuality
https://en.wikipedia.org/wiki/Hypersexuality

Romance is a production of love. If a gay person love their mate; then romance appear. It appears even in the love with no sexual aspects.

Why does your chosen religion disagree?