What is your heterosexuality lifestyle purpose?
Let us assume for a moment that you are sterile as an old mule- just for arguments sake- tell me all about how your lifestyle is defined by who you choose to have sex with- let alone who you are sexually attracted to.
You don't know what a heterosexuality lifestyle purpose is? Why am I not surprised?
Anyway, the heterosexuality of my Wife and I created Life, and much of our lives have been spent providing for the offspring created by our interaction between each other. Can a Gay couple claim as much? Nope, that would be impossible. (I am ready for the pretzel twisting to begin). Then it is to mentor them through the raising of their children.
Am I sterile? I don't think so, but maybe, but no, I am not interested in you regardless.