I think the general assumption to most is that if this body builder has huge, bulging muscles, that he must have a huge, bulging muscle between his legs as well. Of course we know that's not necessarily true. But, most people are attracted to other individuals that maintain a noticably superior level of health.
At least according to my wife, women do usually prefer 6-pac abs and and a baby smooth chest. Toss in some goob bi/triceps, and a speedo with a noticable lump in the front, and B-I-N-G-O .... unfortunate for me, I have the flat, smooth chest, with noticable abs, but no bulging muscles anywhere, particularly where I'd prefer them.