Whenever someone leaves the house, I tell Charlie to give them a hug and to say, "I love you." Haha so when we leave, sometimes he does that to us too!
In general, I try to encourage him to be generous with the hugs and kisses! So far it seems to be working... but maybe he is just naturally affectionate. Nature, nurture... either way, my hope is that he is loving and affectionate with his friends and family!
Is your LO affectionate?