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A woman who frequently gives oral sex to men is said to be receiving her 'daily vitamins'.

To a lesser extent, this phrase can be used to describe a woman who is receiving sex an a regular basis.

The receiving of the 'daily vitamins' refers to the male's semen entering the woman's body in some way.
She's obviously just taken her daily vitamins.
by TheGuyWithTheSleeves January 07, 2012