I take it you've never heard of Eleanor Roosevelt, wife of President Teddy Roosevelt, and confirmed lisbian?
You do know that homosixuals have been in a great many hetero relationships and marriages throughout history. Heck it still happens even today: Tom Cruise, John Travolta, Portia De Rossi, all of whom have or had hetero relationships/marriages.
Now rewind 50-60 years and imagine the social pressures of that period.
I have a gay buddy who married a straight girl to get her a green card. They were best friends. They have been married 12 years and have two kids. The guy is still fully gay and yes he is permitted to have boyfriends.
The possibilities are not black and white, not a dichotomy.
But, one could say that this lisbian felt that she had to marry this man to please her parents, or have a child, or simply have a family. Maybe she had relationships with women on the side. Maybe her husband knew, maybe he didn't. But then the bombs drop, they go in the vault (as she's running to the vault, is she secretly worried sick about her girlfriend?). Then 200 years passes, she wakes up and sees her chance for freedom. Those 50s style pressures are lifted, the apocalypse becoming a blessing for those typically oppressed by 50s American culture.
Definitely some interesting perspectives to explore.