Offline promotion for online projects works well. If it is localized, for women in your city, place up some flyers that will attract them. If it is religious based, maybe ask your pastor if you can include it in the weekly bulletin, or post it up at coffee houses, and the like. Wherever you can find a bulletin board, post it. If you live in a relatively small town, go to your main street and take flyers with you to the merchants there, and ask if you can leave them on the counter. The women shop owners may be interested, or their wives, daughters, or female employees as well as their customers. It's some work, but if you have monetized your site, then it should help cover the trouble to build up the membership. Good luck with it!