Shaving the pubic area is mandatory. Kindly refer to the following link(s):   https://www.assimalhakeem.net/sheikh-can-you-please-clarify-how-the-unwanted-hairs-should-be-removed-i-mean-from-which-parts-of-our-body/ [1]

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It is an issue of dispute. It it best to make it after Fajr of Friday itself.

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The validity of the prayer has nothing to do with it. Kindly follow the links given: https://islamqa.info/en/2602 https://islamqa.info/en/5123I

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If there was no ejaculation, this fluid that comes out does not require ghusl, but it requires to wash that particular area and to make wudhu.

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