He considered this, his playful grin dropping as he squinted. "Humans go on dates, and they flirt. Most of their way of demonstrating interest is verbal."
She looked thoughtful. "We use colored ribbons, mostly.. Uh, touching, kissing the face.. Stuff like that."
She leaned back, looking thoughtful. "Well, people use white as congratulations, black as an apology, blue for confessing feelings or asking to court, red for 'I love you', yellow for friendship.."