Hi jantjen91,
I think it's important to keep in mind that poly is not for everyone. Poly is not even healthy for everyone, as time, energy, and resources are limited, many people find that they can't do multiple relationships justice, and many people are not able to be fair and responsible about how they distribute their limited means. Sure poly has some benefits for those it is right for, but the benefits don't always outweigh the costs. In your situation I question whether your husband is mature enough to handle polyamory in an appropriate manner. He is willing to fudge the fundamental matter of querying about consent. What other fundamental matters is he willing to fudge on? Polyamory demands a high level of smarts, especially emotional intelligence, and he seems a little clueless in that regard.
Polyamory can be one theoretical way of addressing a mismatched libidos situation, however the presence of mismatched libidos does not always make poly a good idea. Each individual couple really has to discuss the poly idea in depth, to see if it is really right for them. In your case you are going to talk to a relationship therapist, and that's what you should do. The poly question is extremely problematic for you, and you need an outside party to help you discuss it in a fair and responsible manner.
I will add that poly is extra harmful if one loves one's new partner more than one's spouse. This can happen with NRE, and is one of the particular dangers that polyamory poses. Again if one can be responsible, and love one's spouse as much as ever and demonstrate that love in a palpable way, then (and only then) poly can be a good thing. So again I ask, does your husband love his proposed new partner more than he loves you? If he does, then he is not a good candidate for polyamory. It's also not hard to see that poly would be a bad thing for you.
In healthy poly, one's primary partner definitely gets a say in one's behavior. Poly should not be carte blanche to just do whatever one wants. One has an original partner to answer to, and if NRE blurs that fact, then one is a poor candidate for poly. Some people definitely use polyamory as an excuse to sleep around.
The question for the struggling mono spouse/partner is, whether they can stand to have their spouse/partner be poly, and more than that, can they actually be happy when their spouse/partner is poly. Sacrifice is all well and good in a marriage, but it goes two ways. The would-be poly spouse should be willing to sacrifice their polyness if necessary to salvage the struggling mono spouse's happiness and peace of mind. A compromise is all well and good, but only if it facilitates the happiness of both spouses.
Sorry, I don't mean to cast poly in such a negative light, but I have real issues with the notion that it's important for everyone to pursue poly, and I guess it's that notion that I am reading into this, and that I am trying to address. Maybe you and your husband can both be happy in poly (or mono/poly), but that is something that only you can decide.
Regards,
Kevin T.