Is casual sex really casual? What is love at first sight? How can you make love last? Do gays love just the way straights do? If you would like to chat with me, I will be "on line" this Sunday evening for an hour, live. And I would love to respond to your questions and your comments about sex, love, lies and 21st century romance. To link in to the live chat, just go to the Chemistry.com home page and click on the link: “Chat live with Dr. Helen Fisher” at 7 pm Eastern Time, 4 pm Pacific Time. I’ll be there, and I’d love to share ideas with you. Happy weekend, Helen.