Ease Me In (The more guarded approach):
These are some of the receipts for my birth control. As you can see, it's not cheap. Since birth control is really for the protection of both of us, I was wondering how you would feel about helping out to cover some the cost.
Just Give It to Me (The no-nonsense tactic):
Even though my birth control is being used in my body, we're both enjoying the benefits. I just don't feel like it's fair for me to cover the costs on my own anymore. If we split the cost, it would only be $XX each. Does that sound fair?