I have a buddy who has a ripped six pack and the thing is when he is fully clothed nobody looks at him while i get a lot of stares.
Attention does not necessarily indicate
attraction.
Most people will take note of a muscular guy. Its fairly conspicuous.
The same way most people will readily notice a morbidly obese man enter the setting.
In my "prime", I got quite a bit of attention too due to my size, namely in the form of stupid questions and comments. However, I learned the hard way that this momentary curiosity rarely manifested itself into any real interest beyond the momentary awe.
As long as the guy isn't excessively skinny or overweight, too many other variables of greater importance are involved. The muscle turns out to be nothing more than an indifferent accessory.