"let my hair down" has implication of sex?

#1 I wrote an email to an American friend of mine. In that email, I wrote I would like to let my hair down, and be myself. I meant I just want to enjoy and relax, as the definition I quoted below: let your hair down to relax and enjoy yours...

) #14 If the babe said, "Why don't I let down my hair and slip into so...

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