Consider it a red flag if you are or want to be married, but don't find it necessary to monitor some or all of your interactions with the opposite sex. (relevantmagazine.com)
Is it a red flag if an employer offers a job interview right away? (careerdigital.com)
I became friends with someone even though my intuition was not only telling me no but showing me red flags in my head. (mindbodygreen.com)