You may be worried about the whole idea of the bachelor party- convinced that your husband-to-be will be spending the night with strippers and alcohol. There are a couple things you can do about this. One option is to not insist on having every detail of the party- don't even ask where they're going. Just assume the best and get on with your life.
If you are really concerned about his party, tell him. You can have a serious talk with him and find out what he had in mind for his party. If he really wanted to go to one last mud-wrestling contest before your marriage, maybe you could accept his wishes. If he had something a little more raunchy in mind, you may compromise with him, or try to persuade him to do something different. You should also have him tell his best man what the party's "rating" should be. If he wants to keep it PG, the best man should respect that and plan accordingly.
Just make sure you don't make it a big deal- if you get too stressed about it, the issue may lead to a postponed, or even canceled, wedding. Don't try to force your fiancé to do (or not do) something he would regret. This is his last big bash as a "free" man, and he should be able to have fun.
