Depends on the person and how the gaze makes me feel *shrug* If it's someone I'm really attracted to (note: they don't have to be celebrity-level attractive, or traditionally attractive!) and they're staring at me intensely...I'm liable to make myself stare back even though I'd rather look away. It's a Moon / Pluto and Saturn thing. I start wondering what they can see.
One time though I knew a Capricorn / Scorpio guy who liked to stare at me and that was basically our interactions but they were communicative nevertheless, and the tension? PALPABLE. It was amazing. I would've ripped his clothes off with a snap of his fingers.
Now, a Sag staring me down I would get uncomfortable. I always want to hide from Sags (and yet I do love them) because you can feel their intensity and I don't like that. I don't like feeling pressured into anything not on my terms or divulging anything not on my terms. I would probably look down and shift, and get uncomfortable, even more so because I know how it LOOKS to them. It looks like I'm shady when I'm not.