One can draw whatever conclusions one wants from the fact, but the Bible says absolutely nothing about masturbation as such. The nearest it gets is Onan withdrawing from his wife prior to ejaculation in order to prevent her conceiving. My hunch is that masturbation was probably regarded as a common bodily function along with urination and defecation, not warranting any kind of specific mention. Men and women have evolved over the centuries but not really that much so far as our essential natures are concerned. All of that said, different people read the Bible in different ways. I read it through the eyes of Liberal Anglican Catholic Christian, rather than a Conservative Evangelical one, and that informs my outlook.