Thanks for your responses, they are interesting. I think maybe i have asked the wrong question. Maybe the question should be would your dh do it? Mine wouldnt as he is not interested in the womens chat kind of thing.
Btw, i dont personally have any issue with him asking mums round. Its just im surprised as a guy he would be interested in the kind of chat that woman have.
I don't think your OH is looking at it right though. Right now, if he's out at work all day he wouldn't have much in common with the SAHMs. The things I talk about with other SAHMs are mostly child-related, or about the family. If your OH was a SAHD, those would (hopefully) be the kinds of things he would become interested in - it's not "women's chat", it's stay-at-home-parent chat
My OH as he is now wouldn't go to a mum's group if he had a day off, but if he was always at home I think he would make friends with the mums because his interests/days would change from being about business to being about kids.