Bay married actor John Schuck, and together they had a son named Aaron. The couple divorced in 1983. In 1987, Sandra Zober and Leonard Nimoy were divorced and over a year later he married Bay. In 1999, Bay and Nimoy made a $100,000 donation to the Museum of Contemporary Art, Los Angeles (MOCA) so it could purchase The Ballad of Sexual Dependency by Nan Goldin. In 2007, they financially supported WACK! Art and the Feminist Revolution, an art exhibition at the MOCA. In 2008, they made a $1 million donation to The Leonard Nimoy Event Horizon Theater at Griffith Observatory.