Sorry that happened. Also, so sorry about your brother...
I think that the problem here is your DH, NOT the women. It seems like a lot of women don't want to blame the DH, but the other woman/women. For real, it is your DH. Strippers are not beneath anyone, it is a job. A lot are mothers, too. They don't force anything on anyone. Customers simply walk through the door on their own free will...
I'd be Po'd if I were you, too, I think anyone would be. Just remember who is responsible for lying to you, DH.
Also, are there often women dressed sexily/models at car shows? If so and you don't want your son to be exposed, could you get a sitter for him so you would not need to worry?
I can only imagine how difficult this is while being pregnant, too. Hugs and best wishes to you.