I have to disagree with much of the advice you have gotten. I see it falls into several categories.
1. He can’t help it, because it is what his friends are planning.
The reason that this is bad advice is because, if you are marrying him you have the right to expect that he should be mature enough to be able to indicate to his friends what he wants and doesn’t want and to prioritize you. Also, if his friends plan something that upsets you, and he permits or even condones that, then that bodes very poorly for your marriage. That is a big red flag.
2. If he is the great guy you know that he is, then nothing would happen.
The reason that that is bad advice it because, if your boundary is strippers, then going to a strip club, is by definition, having something happen. I have a friend in an open relationship and she thinks that her husband having sex with someone else is meaningless to their relationship–as in nothing happens. But, she has no right to impose her boundary on me (and she doesn’t). Just because other women don’t think ogling strippers is anything, doesn’t mean that you should feel the same way. And lap dances are darn intimate. I never understood why a few millimeters of clothes between someone and a naked girl made it nothing. But, if some people are OK with that, so be it. You don’t have to be fine with it, and no one else has the right to tell you it is "nothing."
3. Why don’t you trust him.
That is again misdirected. You don’t trust him because you have made it clear how you feel and he still says he "doesn’t know" what will happen. You would trust him if he told you "I know that you are uncomfortable with strip clubs. I don’t want to hurt your feelings, especially at this time in our lives when we are making this big commitment to each other. I will tell my best man that we can do fun things for my bachelor party, but I expect him to respect you above all, and there will be no strippers. I fully expect he will respect my wishes, and you, as otherwise, he would not be my best man." I am not sure why some bees don’t think that it is reasonable for fiances to assert themselves in this manner or for them to respect their brides.
4. It is the last chance for the guys to have fun with him.
That’s ridiculous. He is getting married, not going to jail or dying. Besides, if fun means naked women, then his last chance was years ago, whenever you two became monogamous.
As an aside, I fully agree with the bee who said that she would be embarrassed to stand at the altar and say her vows in front of men whose last vision of her future husband was of him ogling a stripper or having a naked stripper all over him. Although many people have convinced themselves that this is just a fun party, it is actually disrespectful to the bride, and especially so if she is upset by it. I know that if I was to strip and give men lapdances before I got married, in front of all my girlfriends, in a way, I would be saying to them that I don’t respect my fiance. And, if my girlfriends pushed me to do this, I would be very angry with them.
I am not sure why so many women who feel violated by the bachelor party plans convince themselves that they need to put up with it, or become cool with it. This is the most important time of our lives. We put so much thought (and often money) into the wedding celabrations, the vows, and everything else that symbolizes our love for each other. I’m not sure how strippers became normalized in this context, but if you are not comfortable with it, do not let people shove it down your throat. You must discuss this with him. You must be clear how this upsets you. And, then, if he disses you despite all of that, you have a real problem. And, I am not sure how someone can feel good getting married knowing their clearly stated boundaries and feelings have been ignored.