Is it necessary to get massages after a tummy tuck to drain fluid?

The answer is no. Drain placement for 7-14 days typically is all that is needed to prevent a seroma aftera a Tummy Tuck procedure.  I also use compression garments in my practice to help the skin flap "stick" down to the underlying fascia.  

A massage does not drain fluid.  Some surgeons recommend postoperative massage in order to break up potential scarring and increase circulation to the area that is healing.  While it may have some benefits, a massage is certainly not "necessary."