From all my reading on this forum and my own perspective, I think there are basically 3 ways this lifestyle can work and it really depends on the people involved, which options are viable for them.
1) Husband gets off on humiliation, isn't jealous, is willing to be subservient and let the wife do whatever she wants, because he gets off on knowing she is "cheating" on him. In this case, it seems almost more about the humiliation and sub than sex or voyeurism but, honestly, I can't relate to men like this, so I may be wrong. In this case, wife can basically do whatever she wants and husband will put up with it, while he remains faithful.
2) Husband is not into humiliation or subserviance but is willing / wants to let his wife play around because he has a sort of voyeuristic fantasy of watching her be a slut and gets off on her hyper-sexuality, plus maybe some thrill from the risk involved, which exists because the husband does have the potential to become jealous or upset if he feels disrespected or left out. The husband agrees not to have sexual relations with other women but in exchange, he expects wife to include him / share her experiences and not engage in extra-marital sex beyond what he is comfortable with. Trust and transparency is very important here.
3) Open marriage - similar to #2 except that wife is more free to pursue any sexual relationship she wants and may or may not tell husband about them but, in exchange for this freedom, husband is also allowed to engage in extra-marital sex. Only really workable if both people are not jealous by nature.
It sounds like sharedwife is in situation #2. Unless your husband is a true submissive cuck, violating trust / the agreed upon boundaries of extra-marital play, it's likely eventually going to lead to resentment and divorce, or them cheating, which may also lead to divorce unless you're both cool with an open marriage... which may still eventually lead to divorce lol.
More people would probably be in this lifestyle if it wasn't so complicated and frought with potential for hurt feelings.
Sounds like you've got it sorted for now - just need to play nice and remember that you can probably gain a lot of leverage / have your way, if you just keep your husband's dick hard enough.