Fortunately, I happen to have a few illustrations.

[Rukia finishes off her eggnog before setting it aside, then hops off the couch to reach underneath and withdraw her drawing pad. Has she been keeping it there the whole time? Yes, yes she has. She's never without it, just in case she needs to explain something complicated. She smiles happily as she flips through the pages before finally she arrives at one of many drawings concerning the art of dating.]

As I was unfamiliar with the custom myself, I studied several examples at the library, and took note of recurring themes. Of course, some worlds have different cultures, but I believe these are fairly common.

[Well. Sort of.]