Married woman who wants a woman for sex only -

You are going to think that I am crazy, but I have had the best luck in finding a woman that will enjoy a little sapphic attention is at the grocery store. Look for a young married woman that is struggling with her small child or children. Subtly offer to help assist her while she shops, but do not be overbearing. Then as she is loading her car, slip her a note with your name and phone number. When she invariably asks why, don't give her a straight answer, just say something like, "just because" or "you might want to call me sometime". My success rate for getting a call is like one in five. I have only once not gotten pussy after she calls.

I found that the best place to pick up like minded women was at the gym or pool, you have to ensure you look and act sexy all the time and be prepared to talk to them, it takes a bit of work but is worth it

I agree. However if you are going to try and pick another woman a the gym, pool or any place that women congregate, you have to be willing to put yourself out there at some point and openly admit what you desire or you will be disappointed.
You have to be willing to take the leap when the moment comes. The good news is that there are several women that have the same desire as yourself.