Today's questions: sex, race, and golf

Today's questions: sex, race, and golf - Does anybody out there have an explanation for a demographic phenomenon that has long puzzled me? A couple of times per week, I walk by the Studio City Golf Course's driving range. The ratio of white men to white women beating balls is about 10 to 1. Yet, for Asians, the ratio is only about 3 men for every 1 woman. Among blacks, in contrast, the M/F ratio is something like 100 to 1. (Lots of black guys take up golf, but seldom until they are 25 or older, so you never see them on the PGA Tour. But I've only seen about 4 black women golfers in my life!) I notice the same black>white>Asian M/F ratio everywhere else in golf, too. Any explanations? Also, are there any black caddies left on the PGA Tour? Why are almost all caddies white these days? Finally, why are there more blacks on the Senior PGA Tour (e.g., Jim Thorpe, Jim Dent, and Walter Morgan) than on the PGA Tour (1/4th of Tiger)?