When you remove unwanted hair from your body by waxing or shaving, you run the risk of ingrown hairs. I've had women tell me to never wax my bikini 
line ever, because those hairs are thick and curly, so they tend to get trapped inside the hair follicle and grow in crooked more often than say your leg hair.
I'm not going to let a little ingrown hair keep me from waxing. Oh no. Here's a tip I picked up from a waitress when I was out to dinner one night (really). She said she was way into waxing (don't ask me how we got started talking about that), and she waxed everything, including her armpits (ouch).
Her advice: To prevent those irritating little red bumps you get from ingrown hairs, you must exfoliate the area daily.
Now I'm not saying use something harsh like a sugar scrub on your sensitive parts - I much prefer using loofah gloves. They are gentle enough to use every day.
And exfoliating consistently to remove dead skin cells really helps prevent those suckers. So you can wax and shave all you want and get silky smooth skin without those annoying red bumps.
Jup my beautician told me the same thing two years ago: exfoliate, and uber-moisturise! That way the skin is smooth enough to let the hair grow out (the best body cream I found so far is the ultra rich shea butter L'Occitane one).
1As for waxing bikini or armpits, I've been doing that for years (not on my own though, too difficult) and it's no big deal. I find it way less painful than shaving and then have thick hairs growing back on a sensitive skin ouch!