Size Kink
Being turned on/aroused at a distinct difference in size in comparison to your partner. Usually includes height, muscle size, penis size, and weight. It is generally used when referring to a submissive being turned on at being smaller than their partner, but goes both ways. (being turned on at your partner being smaller than you.)
Ugh, I've got a total size kink; I just go weak in the knees when he wraps his huge hands around my neck!