There is nothing wrong with couples trying things. If you don't want her to do it then tell her. Just know a habit could potentially form from this.
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You and I usually see eye to eye on things. But here is definitely a situation we do not. There is absolutely everything wrong with a married couple trying things of this nature out. You can try out different positions or different scenarios or whatever to stimulate the atmosphere in the bedroom. But there is never a time to introduce another person to that combo. Like someone else said, that's stuff you do before you get married. Later, QD.