What makes a civillian Hummer (or any all-terran-veichle) ? It's recognizeble front mask, their 4 wheel drive, the big size.
Color? Nope, as it is within factory prameters. Air bag,s no air-bags, lether seats, padde,d or something else.. optional internal gear, different colors or dozens of add-ons. All those things are within factory paramaters, and even tough two veichels that roll off the assembly line can differ, they all have the same basic properties that make them what they are.
So when a car rolls out with a 2 wheel drive insted of 4? Well, that a factory defect. It's still a nice car and it will still work well. You can drive it around town and carry stuff just like in a 100% factory approved one. But what happens when you take it off-road for some wilderness exploring? You'll run into problem without a 4 wheel drive..probably get stuck. You'll needed someones help to get you out of sitch. Ironicly, this is what a ATV primary function should be all about.
It's similar with homosexuality. The primary function (reproduction) can't really be done without outside help..a gay couple can't have kids by their own. If you consider the primary function to be the spreading of your genes/DNA, it gets even worse - as that cannot happen with a gay couple. there's no combination of their genes.
I realise that calling it a defect or sickness doesn't sound good. NO ONE would like to be called sick or defective. No ne wants to be reminded or somehow seculded...pointed at. (even if it's true...think about it..if you had AIDS or a mental disabiltiy or anything else for that matter...would you like people pointing that out to you?) ..It pulls out many negative images with it.
Call it whatever you want but it's not normal. It is a defect, but luckily, one of the lesser ones, as you can still function within society without any real problems.