Ventral embrace
An individual encircles another ventro-ventrally with arms. There is contact between heads or chests. Embracing may be mutual or unilateral. There may be a simultaneous grasping of the fur. This is an affiliative contact that may be accompanied by lipsmack.
Thierry, B., EL, B., Baker, S., Matsumura, S., Muroyama, Y., TG O, B., ... & Watanabe, K. (2000). The social repertoire of Sulawesi macaques. Primate Research, 16(3), 203-226.