Out and about, I don't look for a bulge unless it happens to be so conspicuous as to draw my attention to it; and then I am usually more impressed by what it shows about the guy's taste (meaning lack thereof) than about his size.

The gym is a different case. I wear compression shorts as my outer garment, and I often wonder whether they are a bit too "showy" (but they feel so damned good!); so I look around to see whether other guys are showing to any similar degree. There are a few who do; but I have not made any comparative estimates of size, as I don't see how one can do so through clothes.

I only once noticed someone checking out my bulge. I was passing down the corridor at the gym and a girl was coming the other way. I suspect that she was not really thinking about where she was looking, because she was not sneaky about it at all and never so much as glanced in the direction of my face, but had her eyes fixed on my crotch the whole time. I thought it was fucking hilarious.