My wife wears boardshorts but when she started she didn't because there simply weren't the options out there for women that had curves and didn't want something super short.
We've since found a handful of styles (albeit not NEARLY the selection that I have as a man). Most board shorts for women are "short shorts" or they're made for teenage girls that don't have hips. Juniors sizes don't always work for women.
The advent of 4 way stretch shorts help a lot, but again, not a ton of selection for some women out there. My wife is a size 8 and has had a hard time finding options.
Read my thread here for more info: