第四□:爱的传承
B□t kissing□is not just a romant□c gesture—i□ also h□s scienti□ic □enefits. □hen□we□kis□, our b□□i□□ release a coc□t□il of chemicals like oxyt□□□n, dopamin□,□and □□r□toni□□ known as t□e "love□hormo□es."□Th□se chem□cal□ c□n reduc□ stress, boost mood,□□□d□cr□ate feeling□ of attachment and □ondin□. Kissing also □trength□n□ our □mmune system□by expo□ing us to a□variety of bact□ria that can □el□ build□immun□t□.