Be careful what you wish for...........
You've gone on and on and on at her to get your fantasy fulfilled, and she doesn't want it, surely that should tell you something about A) how much she loves you. B) how distressing the idea of sex with another man while you watch feels to her. C) how ashamed she is that you now know something she hoped to leave in her past.
Like most men, you want her to be a ****, but only on your terms!!!! And only for your gratification!!!!!!! I sense absolutely no concern about how she feels, or what she wants. She's your wife, not your sex slave, so try, just for a moment, to think of her for a change.
So she wasn't a virgin when you got married, so what? Were you a virgin? She, and I pity her for this, loves you, and doesn't want her marriage to be wrecked just to satisfy your lusts. She obviously doesn't find the idea of threesomes or groups, or cuckoldry exciting, and you're now using her past mistake as leverage to force her to accept something she finds repugnant. Sex is, within a loving relationship, a shared experience that those involved consent to, whatever form it might take. You are trying to force her into activities for which she has no desire, and you risk ruining your marriage as a consequence.
As for her lying about being a virgin, how many women truly are virgins when they marry, for that matter, how many of you men?