Sometimes when I am going to kiss my girlfriend she makes me wear lipstick or lip balm first why?

Sometimes when i am going to kiss my girlfriend she makes me wear lipstick or lip balm first I asked her soo many times why she apply these items on my lips at first I said no so she gets angry but now she apply lipstick or lip balm on my lips before we got kissed so anyone knows why she did that?
Sometimes when I am going to kiss my girlfriend she makes me wear lipstick or lip balm first why?
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