My daughters say I flirt w/o knowing it -- I think I'm just being myself: friendly, talkative, appreciative, open, funny, happy, smiling. I guess I like to build people up when I'm talking to them. It has gotten me burned sometimes when my open friendliness has gotten some men to think I'm interested in them in ways way more than casual friendship and then they are always coming up to me and 'invading my personal space' with hugs, handkisses, improper compliments -- yikes! The fathers of my childhood friends flirting/coming on like that freak me out! I find it very difficult to curtail that behavior w/o offending the men.
It was safer when I was married -- I was not to talk to any men so that kept me from unintentional flirting for the most part!