We are either born to be gay, or choose to be that way. This dichotomy neatly divides our argument into two parts. Having considered the need to explain male homosexuality in Chapter 1 and having explored its biological bases in Chapter 2, here we reach for explanations of homosexuality as a biological process, and in the next chapter we treat it as a matter of social evolution. So, turning to the task at hand, if we grant a biological predisposition, then what role does homosexuality play in our physical evolution? Such behaviours are either adaptive or maladaptive, and, as James Weinrich (1995) so eloquently observed in his defence of the biosocial perspective, those committed to this view are natural optimists and always look for the adaptive advantage first. So shall we. In this chapter we first explore the case for homosexuality as a gift of nature and then turn devil’s advocate and argue that male homosexuality is a spent force, a byproduct of evolutionary processes.