Sex as Currency and Commodity in "The Changeling"

In a society where access to power and economic resources is skewed between the genders and social classes, sex is the one currency and/or commodity to which all have access. Diaphanta can earn money from Beatrice by agreeing to sleep with Alsemero on their wedding night, money which Diaphanta intends to use as a dowry in order to "buy" her way up the social ladder by marrying, for example, a justice of the peace. By exacting sex (or more specifically her virginity) as payment from Beatrice for committing murder, De Flores has had access to something which his social superior, Alsemero, did not: "her honor's prize / Was my reward.... I have drunk up all, left none behind / For any man to pledge me" (5.3.177-81). In portraying sex in this way, how is the play commenting on its role in a dramatically changing society? Is sex, essentially, the great equalizer? Is it helping to drive the changing power dynamics between men and women and between social classes?