Excerpt from Introduction to Black hole physics, Valeri P. Frolov and Andrei Zelnikov.
In this textbook, there is comment about spin of gravitons as follows:
For gravitating bodies the gravitational charge i.e. their masses, always have the same sign and they attract each other. This property is directly connected with the fact that gravitons have spin 2, while the photons have spin 1.
Can anybody explain to me the reason, why spin 2 is related with attractive force in more detail?
