Look, if your DP really doesn't like strippers this is an easy one.
I would be srverly unimpressed if my DP tried to dictate to me and others what I could do generally and especially on my hen night. You seem to have made that decision for him and are communicating it to others on his behalf. If I was engaged to you, I would run for the hills.
I'm not saying you are wrong about disliking strip clubs. This is a very personal thing. They are absolutely not everyone's cup of tea. If visits to strip clubs are a deal breaker for you, that's fair enough. It is, however, unwise to get to an engagement with abguy without ever having discussed your views. Especially of your feelings are as strong as yours are.
Again, if your DP feels as strongly about strippers as you do, surely he'd just refuse to go.
If he does want to go, you two need a frank discussion and willingness to compromise on both sides.
It might be useful to ask yourself why you object to strippers.
You mentioned you felt watching striplers felt like cheating you. Why? I can assure you strippers will have no interest in your stb husband no matter how SMOKIN' he is. And he will be coming back to you after all :).
Objectification? Well, it's something that happens naturally to both men and women all the time. If your fiance is a typical straight male he will fancy/ find attractive/ imagine sex with many women over the course of his life.
I know my post comes across pretty harsh, but I do think that sometimes bluntness is called for.