I think Hepburn was a little more savvy than that - after all, Margaret Sullivan outright accused her of lesbianism back in the 30s because of her over-reliance on the women who always lived with her. Her famous ‘companions.’
I don’t know if Hepburn was gay or bisexual. She certainly loved Tracy and other men. But those rumors were always rife.
Wouldn't it be wild if Tracy was Hepburn's fake beard, and that's why he stayed with his wife, because nothing was actually going on with Hepburn?