You hear this phrase from women more then men, as having the "bulky" look is not considered feminine in modern society, though I am sure I speak for others as well as myself that I can appreciate a woman with some nice muscle development, bulky or not, i digress. So where did this bulky ideology even begin? As we are products of society, it only makes sense that the bulk fear probably develops when a woman comes across a magazine, movie, bodybuilding competition conveying women (or men) with gigantic muscles. What we fail to understand is that lifting weights is not the culprit, but a small catalyst in addition to two much larger variables, calorie intake and supplements (mainly steroids).
I want you to compare your muscles to crocodiles. It only makes sense to use a wild animal in this example because I have a zoology degree. Did you know that crocodiles grow twice as fast in captivity then the wild? Why? Because in captivity they have more to eat, while in the wild they may go months without eating. So what's my point? The more calories you eat, the more your muscles will grow. In addition, if you've dissected the Nutrition part of my web site, you also understand that a calorie surplus comes with FAT GAIN. And this ladies and gentlemen is what causes the bulky look, the amount of body fat you hold, not how much muscle you have.
As far as supplements, I'll keep this short and sweet. Most of you probably believe bodybuilders, men or women are bulky, but rather, they are some of the leanest people in the world so stop confusing large muscles for bulk. Secondly, do you have testosterone? Do you take steroids? No? Then stop comparing yourself to people that do.