You have androgen receptors (AR) all over your body... through your bones, muscles, and even CNS. Anabolic-androgenic steroids work by way of the AR. They increase anabolism, tissue growth. But the kicker is, you only have so many AR's to occupy (based on LBM).
If all the hammers (AR) are taken - left over workers (androgens) can not help build - but rather find trouble from the boredom (androgenic side effects)
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An indirect anabolic response from these left over (excess) androgens (since their are no more AR's - aka, hammers) is to cross-over bind to gluco corticoids... this action stops cortisol from breaking down muscle.
With our analogy, the left over workers (androgens) stop the neighbor kids (cortisol) from tearing down bricks (muscle)...
Now, if all your recpeptors are occupied and no further indirect action can occur from the androgens - then the excess is waste. And this tilts you closer to the risk portion of the risk to benefit rartion of AAS use...
STOP LAUGHING EINSTEIN!

Feel free to add...