Change condoms between orifices (ass, pussy). Keep your scheme that is colour-coding here well (IE. Light condoms that are blue rectal intercourse, dark blue condoms for genital intercourse). The risk here includes transferring E. Coli, natural bacteria found in the lower intestines, from the ass into the vaginal tract, where it can create a urinary tract infection in addition to STI and HIV transmission. Keep consitently the flora where it would like to be change that is whenever fucking both ass and pussy.