For your consideration is a premise worthy of further study: "That Birth control, introduced in the mid 20th century, has resulted in women's fertility becoming a deterministic variable rather than an inherent biologic trait. This change in female reproductive biology has rendered women, on birth control, by any means, an equivalent role commensurate with that of an invasive hybrid species (or vector pathogen) impacting human ecology by interfering with reproductive outcomes to the extent such selectively neutered women are no longer a viable evolutionary factor in species survival."