I do OK with most women's styles LJP, and I do have a large head in many ways (hat size, for one). Women's styles come in a range of target size ranges, some small, some medium to large. Also, there are some styles that are unisex (for want of a better term), they tend to fit both sexes equally.
You might want to check out
www.zennioptical.com. They have fantastic low prices, I bought several pairs over the summer. I am completely happy with their products. I bought some that were clearly fem, some that were unisex. I wear the unisex styles even in guy mode on some days. You will need to know your own prescription to order from them.

Zenni item #236026