Fishy Behavior

A few months ago I purchased a new male tequila sunrise guppy and several small gold barbs. I've noticed that my new guppy does not seem to be interested in mating with my young female guppy, but rather tries to entice my small gold barbs with its mating dance ritual and my gold barbs have no real interest in him what-so-ever. I have heard that guppies are capable of mating with mollies, platties and sword-tails, but mainly because they all reproduce live-bearing fry, although more often then not the fish which are born can be too mutant for survival. It has been said that a male guppy is more persistent mating then these other live-bearing species and that it can cause harm to other female species. So perhaps my guppy is in no way capable of reproducing with a gold barb and perhaps he is more enticed by the gold barbs because they have similar colors as himself. Or it could possibly be a sign of aggression but it does not seem like overly aggressive behavior as when my guppies fight they have a nose to nose stare down and move around the tank until one seems to tire himself out and retreat.