After researching this topic for so long, I’ve gone through all the low- and medium-hanging fruit, and it has become more difficult to find a new, good source.
One of my best finds so far is a thesis by Anna Robinson of the Central European University, “Passion, Politics, And Politically Incorrect Sex: Towards A History Of Lesbian Sadomasochism In The USA 1975-1993” (2015). (Alternate) It’s definitely the most comprehensive history I’ve found so far of the so-called “Sex Wars” of the 1970s and 1980s, between lesbian-feminists on the one side and more sex-positive lesbians and/or feminists. Definitely a worthy companion to Bienvenu’s “American Fetish” in this particular field (which sadly has little to say about the history of lesbian BDSM).
However, it covers a fairly short period of time, and focusses more on the internal conflict of lesbians rather than the overall history. The history of lesbian BDSM is largely defined by these political struggles, and we know relatively less about actual practice or social organization.
That’s where Lynda Hart’s book Between the Body and the Flesh (New York: Columbia University Press, 1998) comes in. While the second half of her book goes into critical theory, the first half is a good analysis of the complex and often antagonistic relationship between lesbians, feminism and BDSM.
Lesbian s/m discussions, however, rarely historicize the practice any farther back than the early 1970s, and most contextualize it, if not assign it as an originary moment, within the sex wars of the 1980s. It is as if lesbian s/m is a relatively new phenomenon, disconnected from other historical antecedents, born within the contemporary women’s movement. [Hart Pg.74]
Between Robinson and Hart, there’s a much more complete picture of the history of lesbian sadomasochism in America.