So here's something interesting. As well as long hair being a fetish, I've gotten into long nails as well. This probably goes off-topic, but I've also noticed that there's quite a few long-haired ladies out there that grow their nails long as well. As far as a preference, I usually go for the natural unpainted ones. Dunno why, but it just seems better, and more organic, especially with the whole long hair thing.
Only examples are this:
The others are early pictures of Lalana from Sandl Models. Look it up lol.