Final answer:
The passages do not directly answer what Harding believes to be the only reliable weapon men have against women, but they suggest historical patriarchal control and maintaining traditional roles as strategies men used against women's autonomy and progress.
Step-by-step explanation:
The question appears to reference historical views on gender roles and the dynamics between men and women as perceived during certain periods of the past. However, the provided passages do not explicitly state what the "only reliable weapon that men have against women" is according to Harding. The closest interpretation within the context of these passages highlights the patriarchal tactics used historically to control and subjugate women, suggesting that control, discipline, and delegating women to traditional roles of femininity and beauty might have been perceived as the 'weapons' men used against women's advancement and autonomy.
Signs of such tactics are visible in the passages, which discuss the historical roles of women and men and the reaction to women moving into spheres traditionally reserved for men. However, one could argue, based on the tone of some provided texts like the advancement of women, that enlightenment and equal rights would ultimately overturn such 'weapons'. The passages hint at a society grappling with the changing roles of women and men's reactions to these changes.