Futas should count for female pubic hair. Futas aren't normally tagged as male pubic hair, which leaves female pubic hair as the only alternative.
The above search isn't meant to be exhaustive, it's meant to minimize the error rate. Excluding penis is meant to make sure male pubic hair is excluded, even though it excludes futas too. Just searching 1girl solo pubic_hair unfortunately isn't enough, that includes a fair number of posts with an untagged male presence. Look at 1girl solo penis -futanari -newhalf for instance (~1000 posts).