Ease Me In (The more guarded approach):
I know this is awkward, but you're the only [person/people] I can talk to about this. I was wondering what you think about birth control. Do you use it? What do you use?
Just Give It to Me (The no-nonsense tactic):
I just read that more than half of pregnancies for women in their twenties are unplanned. It definitely made me think about my own method. What do you think?