Pisces mars is just about the best thing. In bed.
I have had sex with 4 different Pisces guys... One was gay, one was drunk, one was in a dream and one was married. (I didn't know he was married until later, he forgot to mention it.)
Welcome, nebpsych. 
My first boyfriend was a Pisces. I was seriously in love with him and he was an alcoholic guitarist. It was so strange, we never had any kind of real communication, just a lot of driving at night and knocking on windows and crying. He was my first real sexual relationship and I was completely brainless. I don't know what happened to him but years later, this really cool Tarot reader that I met mentioned him for some reason and I told her I dated him. You were with HIM??? She said. He was absolutely batshit crazy you know.
I said I knew but it took me years to figure it out.
The other Pisces I know is such an object lesson in the way Pisces men relate to women he could be a textbook. A lot of lying, a lot of suggestion, a lot of sexual innuendo that goes nowhere, a sincere wish to never be accountable to any relationship with anyone, and endless inexplicable passive aggression wherein he shames, confuses and manipulates women into bed despite his utter certainty that he is sympathetic to them.
Some things you just have to see to believe.
I must be in the minority here - I have a Pisces boyfriend and wouldn't want anyone else! We've been together for nearly a year now. Maybe it's an opposites attract thing -- our suns are actually opposed down to like a tenth of a degree or something. We have other conjunctions and trine moons so maybe that's what makes everything so cool -- a lot of Aquarius between us too... Just don't know how it all works, but wanted to chime in and stand up for Pisces guys -- or at least the one I have : )