"My sexual orientation is up for grabs, I guess you could say," the Feud star revealed to PrideSource.
Sarandon, though, says she hasn't been able to take full advantage of her sexual fluidity because of her past relationships with ex-husbands Chris Sarandon, who she married at age 20, and Tim Robbins. Now, much to her alarm, she's not being courted by many men or women.
"I'm a serial monogamist," she said, "so I haven't really had a large dating career. I haven't exactly been in the midst of a lot of offers of any kind. I'm still not! I don't know what's going on! But I think back in the '60s it just was much more open."
Even so, there was one romantic relationship she was fond of... and the man wasn't straight, according to Sarandon.
"I did at one point have a very successful and very loving and wonderful affair with a man who then wasn't with another woman after me, and that worked out fine!" she divulged. "I don't think you had to declare yourself as rigidly as you do now."
The man was British actor Philip Sayer, who died in 1989, and the two were co-stars in Tony Scott's 1983 vampire film, The Hunger.
"He was gay, and we had a great relationship in every way," she noted.
Elsewhere, Sarandon got fired up regarding the heat she's received from Hillary Clinton supporters. The outspoken actress famously voted for Green Party candidate Jill Stein, and when asked if she would've voted differently knowing Donald Trump would be president, she said, "To talk about this, for me, is a waste of energy."
"I was not the person who brought Trump into power," she continued. "...We're in a moment in history where you're gonna either be on one side or the other, and to be quiet or to be depressed or to blame me is not productive."
The actress also discussed playing Old Hollywood icon Bette Davis in FX's upcoming drama Feud, which explores the contentious relationship between Davis and her rival, Joan Crawford. Sarandon admits she's never experienced onset rivalry with another female actress because, "I feel very comfortable with all the women that are my competition." Watch the video below for more on Feud.