To answer the question directly - anabolic steroid use is a big turn on!
For me it’s about the mindset of a woman prepared to use steroids to get huge despite knowing the side effects!
She wants to be bodybuilder size so badly she lives with the side effects.
Better yet (getting into fantasy thinking here) if she embraces and/or is encouraged by the visual side effects.
So when a fbb has a deep voice, I know it’s because she has chosen to use steroids to the point where that is her voice now. Same with the facial hair, receding hairline, square chiseled jawline, reduced-to-nothing breasts, enlarged clioris, agression etc etc and it’s definitely a turn on!