No matter where you are, and no matter how pretty you think a strange woman is, keep it to yourself. She doesn’t care what people she doesn’t know think about her, and it’s not flattering for strangers to come up to her and tell her that they have judged her without even knowing her and that she has passed their test. It’s annoying at best. She didn’t arrange her appearance to make you happy, and the idea that strangers are watching her waiting for the right moment to blurt out that she would make an acceptable sexual object won’t make her day better. It sends the message to her, in fact, that you are more interested in her reproductive capacity than you are in anything else she has to offer. Whatever it is she chose to do today that put her in your path you have dismissed completely by focusing on her looks. What purpose do you think it serves to tell strange women that you approve of their looks, anyway? What do you stand to gain from it?
If you see a pretty woman at a skeptical event who you do not know, do not tell her she is pretty. Just because you and the woman have skepticism in common does not erase the fact that she is a stranger. If you tell her that you approve of her looks first thing, she will understand that she is valued more as eye candy than for what she has to contribute to skepticism. She may choose in the future to spend her free time with people who acknowledge right away that her knowledge and experience is valuable, and never come back to your event.
Every chromosome and primate instinct may be screaming at you that a strange woman is the exact kind of woman you want for a partner, and that’s fine. Feel what you feel, but keep it in your head. She really doesn’t care. You may even upset her. Do you get so much benefit from telling strange women that you approve of their looks that it’s worth the risk of alienating them?
PS: If you have been talking with a woman for a while, then she’s not a stranger, is she?