Testosterone is more than libido issues. I personally would not bat an eye if that was the only symptom. The most succinct way I’ve heard ‘normal’ levels (I.e levels near what your personality/identity formed around) is that it makes “effort feel good”.
One of the few people that has written about testosterone in a non-politically charged way for mass consumption is Robert Sapolsky in an essay “The Trouble with Testosterone”. It focuses on dismantling the idea of testosterone as a directly aggression causing hormone. It covers how much nuance there is in studying the link between behavior and testosterone.
AFAICT women are more resilient to changes in hormone levels and a lot of their hormones come from a system less effected by opioids. Not the HPTA->gonads. There are those women who take smaller doses of testosterone to combat the effects of opioids like methadone or pain medications.
It’s a painfully complicated subject. I’d hope anyone considering methadone should note chronic opioid administration of any kind can suppress testosterone. Someone shooting dope 24/7 does themselves no favors in dismissing methadone for fear of low T as it’s not unlikely their T levels are probably already a lot lower than ideal.
Link to Sapolsky essay in a book he has: https://www.amazon.com/Trouble-Testosterone-Essays-Biology-Predicament/dp/0684838915/
Books by Robert Sapolsky would be the closest I could recommend off hand (as well as host excellent online lecture series, which you can grab on YouTube.)
Trouble with Testosterone and other essays
The Trouble With Testosterone: And Other Essays On The Biology Of The Human Predicament https://www.amazon.com/dp/0684838915/ref=cm_sw_r_cp_api_i_2CkoFbWDB8C2Z
Is a book I recall being quite good.
Mind you - you asked for neurological detail. You’re going to get very limited bridging of anthropology and neurology by any credible author. There are a lot of tbd’s imbetween.
Sapolsky definitely is the closest that I can think of off hand (I’m a neuroscientist, not an anthropologist, incidentally). His work on stress hormones and hippocampal damage and the context surrounding that - stress being evolved as part of a short-burst fight/flight response that can be chronically active in humans. Sounds along the lines of your question.
Read this book. It explains this nicely.