I'm around 4.5-5" flaccid, which is well above average, and because of this will have a noticeable bulge, mostly whilst sitting down but sometimes standing as well. I've had many instances where people, both men and women, would notice my bulge and blatantly stare, some even in very sexually thirsty ways.
I'll cite some examples
- In my Chemistry class during lab for some reason I was sitting against the lab bench facing the rest of the room. I noticed this girl who wasn't sitting too far away staring at me so I naturally checked myself and noticed what she was staring at, which was a blatantly obvious bulge. One of her friends looked to see what she was staring at, noticed it and then immediately turned her head away in embarrassment.
- Had a Latina who was my lab partner in Anatomy and Physiology in college, very relevant to this, who developed a real obsession with my bulge. First time I noticed it was during lecture, we sat next to each other and I see her staring at my crouch and again had a massive bulge through my jeans. She'd stare at it for several seconds, briefly look back to the professor but only to return to staring at it again with a hungry smile on her face. Instances like these happened several times over the course of 2 semesters.
Besides that I've had several experiences of people noticing it and staring, those ones just stick out in my mind. Most of the people I spend enough time around will pick up on it at some point, though it isn't something that I parade around or mention at all.