I've got some female friends, which for purposes of this discussion, I've known pretty much all my life. These 'some' are now married, and with children. happily married. Yet, because of the extremely close bond, long friendship, etc.... they flirt with me, when I see or talk to them, constantly. Why? My guess... is because they feel completely comfortable with me, KNOW that it is innocent flirting because we're already so close, they have nothing to fear of someone having the wrong idea, no threat.... and they get that extra lil attention that all human beings crave. Their husbands don't wink an eye about it, why? My educated guess... because they know very well how long/deep my friendship is with each of these women, because these women have communicated that with their husbands.
You only hide something when you fear it being discovered.
If it's innocent, one wouldn't need to hide anything.