Self-described “serial monogamist” Susan Sarandon recently told a gay website her sexuality was “up for grabs.” “Is your sexuality more or less rigid these days? Basically, should we be welcoming you to the family?” an interviewer with PrideSource.com asked the 70-year-old actress in an interview published Tuesday. “Well, I’m a serial monogamist, so I haven’t really had a large dating career,” Ms. Sarandon answered. “I married Chris Sarandon when I was 20, and that went on for quite a while — each of my relationships have. I haven’t exactly been in the midst of a lot of offers of any...