They are experimenting with different models of human behavior, here is from Modern Love:
At first his behavior was endearing. He constantly gave me attention, lavishing me with compliments, calls and sometimes gifts. But one morning when I slid out of bed from next to him, things felt different. All his wooing suddenly repelled me.
I crawled back in and tried my best to pretend things were O.K. He showered and dressed. I clenched my teeth when it was time to kiss goodbye, then shut the door behind him, sighed and wondered if he had any idea.
We learn from this same column that butterflies can see with their genitals. And from the NYT Sunday Magazine, here is a Death Row love story:
“I knew you were going to say your favorite color is blue,” he wrote. “It belongs to you. My favorite colors are black and crimson. I love deep, dark red things made of red velvet.”