My first thought is what would she do if she knew you saw those texts?
You started out this thread with the idea of going to a sex club and it sounds like you and your wife talked about it. You also said she said she would be comfortable to go as far as "letting men view" her. These texts seem to suggest she's searching on her own and probably with intentions beyond just "letting men view" her. Sounds like she's comfortable enough to want it but not comfortable enough to tell you she does.
If you want it to happen and work out right it's going to require you and your wife to talk about it.If you don't want you wife to know you looked at her phone I'd go back to the sex club discussion. Maybe you could ask something like, "Honey, what if you met someone there and you wanted to do it again?" You could work your way to a question like, "What would you look for in a guy if you were choosing? Maybe we could find a guy like that around here."
Just thinking out loud.
