For males and females.
For this example, I am male, so let's focus on males. First of all, assumptions:
Muscle size is not important to me. I don't feel as though I have to build muscle to be attractive, and I'm fine with my own size, so any benefits/assumptions aside, muscle mass means virtually nada to me. Including this in this mix, a certain figure of testosterone in any assumptions would not hinder goals since building size is not a priority to me, so all figures representing T-levels in this regard are not relevant.
It would be wise not to assume building X specific amount of muscle is a top-priority to me.
What is my priority, you ask? Strength. Studies correlate testosterone with muscle strength in regards to muscle size, yes, but there's no hard evidence that both must go perfectly hand-in-hand to improve one.
In other words, there's no 100% correlation from muscle strength potential to muscle size and mass. Pre-pubescent children have built phenomenal strength with low-testosterone. People who have undergone gonadectomies have not been doomed to succeed in building strength either, although can be very hard.
In short, assuming I have low-testosterone, how limited would I be in building purely strength?
Strength is not just muscle mass but potential: myofibril execution, nervous system, mind/body control, etc.
My current routines/maxes:
Squat: 1 time a week, 3 reps, 50-80 lbs., 100% deep.
Biceps curl: 50-80 lbs., 1-3 reps, 100% perfect form, once or twice a week.
Deadlift max: 280 lbs.
Squat max: 120 lbs.
Deadlift max: 600 lbs.
Squat max: 300 lbs.
NOTE: I have absolutely no sexual dysfunction symptoms associated with low-T (but could still have it). Consider this question, to some degree, hypothetical, because I'm assuming I have low-T based on failure to improve much strength. I'm not seeing any physicians/doctors/etc., so don't bother telling me to.