If dense objects curve space producing what we know as gravity what do magnets curve to draw opposites towards them?

A magnetic field is a field produced by moving electric charges, by electric fields that vary in time, and by the 'intrinsic' magnetic field of elementary particles associated with the spin of the particle. There are two separate but closely related fields to which the name 'magnetic field' can refer: a magnetic B field and a magnetic H field. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field.[nb 2] The magnetic field is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. The relationship between the magnetic and electric fields, and the currents and charges that create them, is described by the set of Maxwell's equations. In special relativity, electric and magnetic fields are two interrelated aspects of a single object, called the electromagnetic field tensor; the aspect of the electromagnetic field that is seen as a magnetic field is dependent on the reference frame of the observer. In quantum physics, the electromagnetic field is quantized and electromagnetic interactions result from the exchange of photons. from wikipedia

Interesting question. There is a presumption with the question that gravity and magnets work on the same principals. I don't know but I think they probobly don't. However, if we assume they do then what magnets bend must be something emmited from certain types of metals since magnets do not attract and repel everything just certain things. Gravity works for everything, so that is a huge difference right there. I was thinkg geiger meters detect some type of ion radiation. Metal detectors, detect something from the metal? Whatever it is that metal detectors detect might be what magnets bend?

Magnets bend electric currents.

The specific spin of the positively or negatively charged electron, and molecules. It's led to the theory of how opposites attract.

Well ! I thik I must be a Magnet...I seem to draw the attention of peoples eyes...God knows why.... :)P