This may or may not be a thing people do, but is sure grabbed my attention:
Oculolinctus, also known as "worming" or eyeball-licking fetishism, refers to the alleged paraphilic practice of licking eyeballs for erotic gratification. In mid-2013, it was reported that this alleged fetish was popular in Japan, where it was referred to as "Gankyū name purei." A new "second base" when kissing got boring.
Turns out this can also lead to a lot of eye infections! I wondered, is pink eye just the new hickey to some people?