For the best advice on sex, love, dating and relationships we ask two experts with personal experience. Cathi Hanauer is the author, most recently, of Sweet Ruin, a novel about love, marriage, and adultery. Daniel Jones is the editor of both the "Modern Love" column for The New York Times, and Modern Love, an anthology derived from the column. They've been married for 15 years, and together they provide a his and hers take on relationship questions. This round: pregnancy and dating. Question: Entering my forties as an unattached woman, I decided to try to have a baby on my own. Weeks after starting an artificial insemination program, I've met a really great guy. When do I tell him about the A.I.? Odds aren't great that I'll actually get pregnant, and it could end up freaking him out for no reason. —O.S., San Francisco, Calif.