As the person above said: 성향자 = 성애자 "Are you gay?" would be the correct translation.

성향자 = 성애자 a person who has an abnormal sexual orientation. 세요 means "Are you?" 성향자세요? means "Are you a person who has an abnormal sexual orientation?"

that's incomplete and unusual sentence so i don't know either if there is no context. 성향 means tendency, inclination, disposition, it might be 'are you homosexual?' but i don't know exact meaning of that.