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