I don't understand the title question of your thread...

What exactly did she do to you???
Nowhere in your post do you mention her hurting you or wronging you in any way. You call her "loose" yet you say she's not a cheater.
If she's so loose, why is she not out finding herself enjoyable sex since she's unsatisfied with the sex in your relationship?

What makes her so immoral in your eyes? Premarital sex? Well, you're not a virgin either you know, so you are both immoral now.

A few rhetorical questions for you to answer for yourself. I have no need for the answers, they will help you see more clearly though...

I don't think you love her, your opinion of her is very poor, it doesn't reflect love, it actually contradicts it.

Do you mean she doesn't enjoy sex because she has experience, while you have none, so you feel like you have no clue what you're doing?

If so, then talk to her, find out how to please her, to make sex enjoyable for both of you.

If however you mean to say she physically can't enjoy sex because she's not a virgin / or wasn't a virgin when you 2 met, well that's just bullshyt.

If that were true nobody would be having any sex because (besides pregnancy) the point of sex is enjoyment.

The bedroom can become very routine for some couples though, and sparks do die, but that's why there's a huge market for Sexperts in the world. They keep couples happily together by educating people about how to spice things up and reignite the flames of passion.

A word of advice though, idk any woman who would enjoy sex with a man who has such a low opinion of her.

It may just be your attitude that keeps her from enjoying sex with you.

One last thing, her past is just that HER, PAST. Its HERS, which means it has NOTHING to do with you, its in the PAST, which again has NOTHING to do with you, it is BEFORE you existed in her life. Its none of your business and the only reason its an issue is because YOU are MAKING it an issue...

If you can't live in the present, and enjoy the present with her, if you can't look at her with adoration instead of judgment, then please let her go. Care about her enough to set her free to be with someone who will love and adore her the way she deserves. And in so doing, find yourself a girl you can adore and cherish, one with values more similar to your own, one who will escape your judgmental beliefs.

Because the truth is, you both deserve to be happy, and maybe the 2 of you are just too morally mismatched to work out longterm.