I myself have not,but a friend of mine was banging one off and on for a little while back in the 80's. She just wanted to try some real dick for a while. I knew her as well but never did anything with her or tried to. My friend told me she had a tight pussy and was very good in bed.

Never got as far as fucking her.
 

Or even close but many moons ago I was out in a nightclub with a group of new work colleagues. Later in the night we bumped into one of the guys partner and her friend. I ended up dirty dancing with the friend and after a while she leaned in and kissed me on the cheek. I nodded encouragement and she dipped and started kissing my neck. Before long we were kissing and groping in a corner of the dancefloor. I bumped into her a few more times around the 3-level club but nothing more happened.

The next Monday my colleague mocked me for following this girl around like a puppy as,"She was a full-on lesbian with a girlfriend and you'd have no chance."

I just smiled.

Fucking a lesbian
 

When I was in the Army I had a Sergeant who was in my command and we went TDY and ended up in bed together. She was good!

My first girlfriend was gorgeous, skinny and very shy. We dated for about 6 months when we were about 14. About 4 years ago I got sucked into Facebook (Which I quit after about a month) and posted a few pictures. I got some responses from old friends. Sure enough I got a comment and friend invite from my old girlfriend. If she did not say who she was, and I had only seen her picture, I would have never know it was her. She had pictures of herself and her lover and their dogs (I love dogs so the pups were cute). She had gotten very large and very butch. Of course I told one of my friends, who said I must have been a lousy lover and turned her off to men. I say it was because I was so awesome she could never find a better man than me so she turned to women. Its funny, we as guys have this fantasy that the lesbians are going to be too hot babes. This girl, who was a beauty young women, turned into a large butch lesbian.

I had the same experience as John43. I dated a girl for a few months and had doubts that she was at least bi; took a bath with a female friend, was very cosy with her etc. We broke up and a few years later, met her in another town (we moved to the same city) and met her girlfriend. She's on my Facebook and I chat to her on occasion.

Can't say I've ever fucked a full lesbian, but I have been with a bi-girl though. Wonderful girl with a great body, a dirty mind, and a gorgeous face.