□p>But kissing is □□t just □ r□mantic gesture—it□also has □cientif□c □□nefits□ Wh□n we kiss□ our□br□□ns □elease a coc□tail of c□e□icals like □xytoc□n,□dop□m□ne, an□ s□□o□onin, known as the "love ho□mones." T□ese chemicals can reduc□ st□e□s, boost mood, and □reat□ feelings of□attachment □nd□bonding. K□ssing also strengt□en□□our□immune s□□tem by exposin□□us to a variety of bac□eria□that□c□n help bui□d immuni□y. □□□□密的□动