I haven’t done this yet — I’m still fairly new as a trainer — but my personal trainer in NH did this a lot. She offered classes based on what her clients told her they wanted — such as Zumba, yoga stretch, Pilates, kickboxing, balls bands & weights, and more. She would switch up the schedule every quarter or so to reflect her clients’ needs and whatever new type of workout clients were clamoring for.
This did a great job in attracting new clients — my trainer knew the trends and capitalized on them with her classes. Some of these new class clients became personal training clients, or went from taking just one class to taking several per week.
If you have the bandwidth and space to offer a bonus class for women, why not give it a shot? If it doesn’t bring in new clients, all you’ve wasted is some time and possibly a small outlay of money in marketing the class.