Your wife shows a lot of good indicators that she'll eventually try a new lover or two, or more. It sounds like she's still testing the waters as to whether you're serious or not; you maybe should think about that as well. Are you really serious in letting her take new lovers, because its not that easy to put the contents of Pandora's box back in the box once they're out. She's the one being logical and cautious here. She enjoys her marriage with you, she honors her marriage vows, and she simply uses your videos to stimulate herself while having sex with you. But, the teasing will eventually get old, and she'll want more, and that's where she wonders IF she does, if she gives in, how will you really act, and look at her later on. And she probably wonders, too, if she gives in, does this mean you'll be freed to pursue other women when you desire ... because women don't like sharing their husbands with other women, and is a main reason why this wife sharing is so illogical to them.
And to be honest, a lot of men aren't totally sure, themselves, how they'll react
later, after their wives have given in and began pursuing other lovers. You'll not always be there to see it, or even know about her affairs, but later, you'll sometimes be able to tell when she's been with another man, and her time
with you will become more limited as she makes time for her lovers. So, these are things to think about before you continue encouraging her ... as I said, the indicators are there that she'll eventually try it. One of those things that escapes from Pandora's box that is hardest to put back is
your feelings for her should you realize, later, it was a mistake. Emotions are hard to eradicate. I believe she may know that and you just haven't given it all that much thought.
You guys are young ... she's 23? Wow ... everyone that young deserves to sample the wide assortments of sexual fun at that age before you become too old to either do it or attract the ones you'd do it with ... so, best of luck.
Mac