I pray that you will get to know some of these fine people, because you sound like a person who believes in your own life experiences. To get back to your theme scriptures, Ps. God, who breathed Spirit into each of us, has showered out many blessings for which we should all praise God, including our sexuality. You asked for illustrations of animals that sexually engage their same sex. I have a male dog, and I have known many others, who mount other dogs, male and female, and even the male cat.
Cows mount each other when they are in heat.
You could learn about other examples from The Learning Channel or The Discovery Channel, or Animal Planet. But let's look at humans, who God created to return His love and fellowship. As a sexual person yourself, it is likely that very rarely have your sexual activities resulted in creating another human being. God did not give us this great gift for procreation alone, but as a means of expressing our love and devotion to the wellbeing and satisfaction of our beloved. This human feeling is not restricted to only one sex or only one orientation.