Anna was born into a culture where the expectation is no sex until marriage. Over time, she's realized she has her own religious reasons for saying "not right now".
Most of Anna's friends are sexually active, but she doesn't judge them for their choice. She asks them questions about sex and they ask her for advice about relationships. Just like any friends would do.
Because she's waiting until she says "I do," Anna's friends ask if she's afraid of not liking sex with her future spouse. Sure, it's a bit of a risk. But for her, the benefits outweighs the costs and she's sticking with her decision to wait.
Once it's your own choice, that's what keeps you truly motivated.