Yeah you can generally tell, the neck and shoulders have more androgen receptors so they will typically have bulbous shoulders, oversized traps and a thick neck. Other giveaways are early balding, back acne, and rapid muscle gain. And huge mass monsters are pretty obvious. If you were really interested you could take a look at Jesse James West on YouTube. He’s about the peak muscularity someone can reasonably achieve without steroids outside of genetically gifted individuals. He interviews gym girls often and they rate him so low haha.