I don't think there's any less assistance for men than women. There are loads of networking clubs and business coaches available for anyone in business.
That said, I think women have made the move to establish "women only" groups to help deal with things like working around a family and some of the challenges they face with having kids that many men don't (yes - I'm generalising!)
As a woman in my 40s without kids, I don't really feel part of that crowd, so I've not really involved myself with "women only" groups or programs. Instead I've become involved with networking groups made up of men and women, and used the resources freely available to all - like having a free ATO tax consultation at my home office, and connecting with local business support groups.
I also really enjoy the different ways men and women think, so I'd be reluctant to only deal with other women in business. Personally, I don't really see much appeal to gender-specific groups, but again, it may be because I don't have kids.
And if you can't find what you're after, then maybe set up a group of your own
Disclaimer: I am actually speaking at a women's networking group on the 21st of Feb. They've asked us to host "The Shift" event for them, which we ran in October to help anyone in business learn to utilise their online space. I hope to meet some great new contacts, as I would at any networking event.