you could say something like this:
"you know what a gaydar is right? well this is the exact opposite and when my cheeks detect beautiful women, they light up. honestly you look like every other woman to me except my cheeks can tell me the truth. your personality is where it counts though. i look for women who are trustworthy, smart, and outgoing. you have 2 of the 3... not a bad start

"
a bit of mystery in there and making her jump through your hoop. also, it will show her that she is hot (which she already knows) but she needs to show personality to impress you