There is nothing wrong with her not being a virgin. In fact, it might be a blessing in the sense that she has prior (although not the greatest) experience. Therefore, she is capable of advancing their relationship and pushing the MC to do more. I mean it's chapter 1 and they are already holding hands which is 10x better than what we usually get. However, she seems like a person who say yes to everything and I can see that it would be the MC's job to try and fix that.