So I was thinking as I started my new Bounty Hunter (finally a non-sith for me!): most races are attracted to similar races. For instance, most human beings are not attracted to monkeys even though biologically we're very close. We're not attracted to dogs or cats or bears or anything like that. It's understandable in the Star Wars universe that we might be attracted to Twi'leki, who are not all that much different, or a number of other humanoid & semi-human races.
I don't understand, however, why Hutt like to keep females chained up with them. Why would they be attracted to them? They're about a 20th of the same size, completely different body style (never mind genitalia), and are genetically incompatible, as most races would be. So what's the point of all of the slave girls kept as decoration around every Hutt's "palace"?