Two friends are discussing the possibility of love.

"I thought I was in love three times," one friend says.

"How so?" his friend asks.

"Five years ago I deeply cared for a woman who wanted nothing to do with me."

"And that wasn't love?" his friend asks.

"No," he replies. "That was obsession. Then two years ago I deeply cared for an attractive woman who didn't understand me."

"Was that love?"

"No," he replies. "That was lust. And just last year I met a woman aboard a cruise ship to the Caribbean. She was smart, funny, and a great conversationalist. And everywhere we met on that boat, I would get this strange sensation in the pit of my stomach."

"Was that love?" his friend asks.

"No," he replies. "That was seasickness."