Women can only show their hair to their husbands and other women that they know.
Kosher is really complicated
You can’t mix meat and dairy, it’s a sin. So much so that they have their own silverware, dishes, etc. You would even have to completely change your tablecloth…
Also, you couldn’t have a chalavi (dairy) dessert after a meat meal. Unless you want to wait 6hrs.
Also niddah (/taharas haMishpacha/family purity) is not about being dirty; it’s a state of ritual purity (or lack thereof) that happens naturally with a woman’s cycle and has to do with being able to enter the mishkan.
Because life is the most holy and sacred thing there is, when life doesn’t happen, it leads to a temporary state of ritual impurity that is changed by immersion in a mikvah. It’s not necessarily 12 days, either, it’s all tuned in and dependent on the woman’s natural rhythm.