The theory behind waxing is when you pull out a hair from the root, your new hair comes in finer and thinner. Often, some of the hairs don't grow back. For many of my clients, the hair stops growing across the front of the bikini line but continues to grow in the undercarriage. I believe there is more blood and energy down low which encourages more hair growth in that part of the body. The other day a client, who  has very little hair across the front of her bikini line, told me that she had a goat's beard down there. It was an accurate description.