It depends on what type of face shape and how can you makeup yourself. Just a pair of square black framed glasses can't provide you sexy look. you must wear some tight clothes or sexy clothes and with a pair of oversized glasses, particularly sunglasses. And when it refers to sexy glasses frames, cat eye glasses are good choices that to make you look sexy.
I think it is hard to figure out whether women in square black framed glasses sexy or not except knowing your face. There are some tips about different faces and glasses you can take into consideration. Square face should not wear glasses with angular, glasses with thinner frames and rectangle or long elliptic lens will be very good. People with long or narrow face should avoid glasses similar with their faces, such as narrow on the upper and down frames or thin and long glasses. If you have a round face, you should not wear round glasses, it may make you looks rounder and rounder even fatter and fatter. Wide faces will not look good with round, oval or small glasses. And glasses with wide, square or angular glasses will be better. Lozenge faces are also fit with round or oval glasses. Personally, I think black means serious and grave, but not sexy. Look in the mirror and make sure what kind is your face and what kind of feeling you want to present yourself, youâ€™ll which kind of glasses are fit for you.