BFWF (Black Female White Female), BWWW, BW/WW, and Black woman with white woman refers in porn to a black woman who has sex with a white woman in porn.
There is also AFBF, AFBM, AFLF, AFLM, AFWF, AFWM, AMBF, AMLF, AMWF, BFLF, BFLM, BFWM, BMLF, BMWF, LFWF, LFWM, and LMWF, among others.