i am extremely overweight. high body fat as well. maybe thats why my testosterone is so low. i also read just today that bad sleep quality can significantly lower testosterone up to 40% in extreme cases(sleep deprivation) and cause ED in men. then there is p*rn habits, jerking off too often(I used to do it regularly 4 times a day when the average is actually less than once per day for my age. this hit me by surprise, the study also showed 20% of early 20 year old men only jerk off once or twice per week, i wonder whether that is including sex or not but i guess not otherwise the study wouldn't make much sense would it)
by said study only 1 in 10 men masturbate everyday. this might include men with partners so it might be a little higher, however you can't tell me jerking off 3 times a day is the norm rather than the exception.
also morning wood says very little about sexual health, what matters is whether you can have nocturnal erections at all. for example i have not had an erection in the morning for over a decade but when i wake up at 4 in the morning i do. also people often claim not having morning wood is proof of it not being placebo, that of course is blatantly false as especially during the wake up phase and sleep, insecurity and thoughts you have during the day get processed. it can definitely have an effect subconsciously
psyche is also very important, when i am socially isolated for a long time and depressed i have zero libido and i mean absolutely zero.
so sides exist but a lot of them are probably combatible to some extent