I'm not 100% sure what would qualify a pipe as "feminine", but here are a few attempts:
Mario Grandi makes some interesting designs, some of which might qualify as feminine:
Pipe Mario Grandi Italy Briar Smooth Fiammata Free Hand New Pipes | eBay
I'm not 100% if you would consider the previous pipe feminine, but it is gorgeous and if you don't buy it soon, it may not be available (I'm trying very hard not to bid on it since I already have 2 Mario Grandi pipes and I bought another last week which is still in transit). Just look at the unusual yet somewhat delicate shape, blonde coloring, nice metalwork...
If you can find one, how about the Peterson Beligique: Belgique and Calabash Briars