I actually have asked customers - both men and women, but the main issue is that only a small percentage ever contact me for pre-sales or support inquires (which is nice in its own way), It never hurts to read academic or professional studies with a broader scope, though.
Bribe them. Give them a promotional code that gives them $5 of one of your other products, and let them give a $5 discount to one of their friends. You'll be able to purchase information about your target market.
