Why did she lose her virginity first?

My sister is 20 years old and has been in a toxic relationship bc she had feelings for this guy but he only saw her as a sex object. She told me today she lost her virginity to him but cut ties afterwards. He is a jerk let alone ugly as fuck. I don’t feel jealous at all but at the same time I question how the hell she lost her virginity first when I am physically better looking not to mention have a better figure than her. She is not physically that attractive but she lost her virginity first. I am 17 years old. My my is freaking out after my sister told her about it and now she is overreacting over it and I am super annoyed by the whole situation in general
Why did she lose her virginity first?
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