Why do we have more than one ual orientation?

I have a theory for this that is based on behaviorism. In the process of making enjoyable, which it must be or the species would face extinction, nature has provided that same pleasure to occur without actual . Since ejaculation is pleasurable for a male during in order to further the propagation of the species, it is just as enjoyable when it occurs via masturabation and . Thus we as sentient beings can choose which form our pleasure will take. Since it has apparently unhampered our ability to propagate, there was no reason for nature to select it out as it selected out such things as heavy body hair over the course of time. So since act A, B, or C brings pleasure we will seek out said acts equally to gain that pleasure again.