To be honnest I never heard of how dolphins are supposed to be kind of sexual to women. And thats coming from a guy who is active in a community where human-animal relations are taken to the max...
I've met plenty of people who feel attracted to them, but never have I heard about it being a 'general' thing, or that dolphins are by definition a symbol.
And in addition to Rexy's story:
Dolphin Toy...
And yea, I guess that with inteligence comes brutality. Dolphins can indeed be very aggresive creatures when cornerd, or even in the wild. Tho I think the harrasing is more of a instinct then an inteligence thing.