Reasoning showing homosexuality is evil.

[WinterHold]

It's still far more than simply ejaculating. Otherwise how would a 'straight' person get the inclination to "indulge" in sex with someone owning similar genitalia in order to "become gay"?

Neuron connections in the brain:

http://college.usatoday.com/2015/06/19/5...in-learns/

2. Practice leads to stronger connections in the brain
When it comes to creating stronger, faster connections in the brain, practicing the skill or information that you wish to fully master is essential. This is because regular practice — whether it involves reading a history textbook, listening to a science podcast or solving a calculus problem — causes your dendrites to grow thicker and to coat themselves with a fatty layer. With enough practice, these thickened brain fibers will eventually form double connections to one another.
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When this occurs, signals carrying information can travel faster to and from different parts of your brain. The fatty coating on brain fibers also speeds up your brain’s ability to process information. Brain fibers with double connections are very strong and enduring. Thus, continually practicing a given skill to acquire information or ability can help solidify that information or ability in your brain more permanently.

I think watching porn and having sex and even just looking, are all practices that reinforce the prior connections in the brain.
So a hetrosexual simply didn't go through the same experiences, that result in forming new connections that ease lusting for the same gender.
While a homosexual got their brain wired to support homosexuality or lesbianism.
Bisexuals -like me- have both connections. I can track my lusting over females from watching women in Saudi malls; and usually seeing nothing but their legs and feet. So I grew this fetish very strongly. I'm sorry if you find it weird. But really; if a woman is wearing shoes, it's a huge turn off for me. That's a whole network built inside my brain; and to erase it science has to invent something to override brain neuron networks and memory.

The more you practice or exercise, the more you get better at what you do.  Neurons; I would say. No wonder God said in the Quran:

( 32 )   And do not wish for that by which Allah has made some of you exceed others. For men is a share of what they have earned, and for women is a share of what they have earned. And ask Allah of his bounty. Indeed Allah is ever, of all things, Knowing.