just ask them, I hobby with my wife and until we asked around we had trouble finding info, most who see couples or women will list it somewhere on there site, also put the question out on the local board closest to your hometown, they will respond

a field titled: "two girl action?" Answers can range from "no" to "Yes - Really Bi".  Do a search based on the "Yes" reply (read through your options and you should find it) and see what comes up.  Don't forget to put in the area code that you're interested in, as this will narrow it down quite a bit.  Then you can broaden your search if you don't get enough matches that interest you.

lady hobbyist. I'm sure there are more, but she is the only one on TER. She posts on the DC board. You may want to check there, and maybe contact her.