Keep losing money, geniuses at Hobby Lobby, and eventually you won't have to worry about what icky things your employees do - because you won't have any as you spiral into bankruptcy.
As a business owner myself, I'm not really all that concerned if my employees (who happen to be primarily female) use birth control or not. I am concerned with outlining their job functions, and ensuring that they're doing those jobs to the best of their ability. If they need guidance, I provide it. If they have some kind of personal issue and want to talk about that with me, I'm fine with that and flattered that they would ask me. What I absolutely would never do is force my personal ideological beliefs on them, ever, or expect them to ascribe to my lack of religious beliefs. I didn't (as some CEOs did) threaten to fire them if they didn't vote the way I wanted, or paint some dire picture of the economic outlook for the company if Romney had won - even though I firmly believe that would have been a disaster. Likewise, whatever they do in their bedrooms, in their lives, outside the realm of their work for me, is their own: they are all responsible adults, capable of making decisions for themselves and their families that do not and should not involve whatever they worry I may think of those decisions.
So, Hobby Lobby, keep tilting at those windmills. It's always nice to see the business version of Darwinism in action right before our eyes.