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The main negative effects of the b/c are the increase in SHBG (which will bind free androgens/anavar) and stop them interracting with the receptors. The increase in cortisol (most anabolics reduce cortisol so it probably cancels out the effect) and in the case of progestins, competitive binding to the androgen receptors. I think women who are using a lot of gear (big cycles, var, primo combined, etc) have so much anabolic hormone cycling around that it makes the slight increase of SHBG negligible, and the competitive binding of the progestins almost nonexistant.