Ear nibbling is one of the most interesting things one can do to their love lives. Whether in the context of sex, making out, or just saying hello, nibbling someone's ear will not go unnoticed.
In addition to being a unique greeting, some people find ear nibbling very sensual. Some people are driven wild by the slightest bit of hot breath in the ear and a playful bite. Some just burst into a fit of giggles, and others deliver a slap to the side of the nibblers head1.
Really, it is quite simple, you nonchalantly move your mouth to the ear lobe and gently2 begin nibbling. You may or may not move up to the cartilage if you choose. For people who are better acquainted, the tongue can be used as well3.