Do you try to commit to memory all your sessions or just the good ones?

It's become my little memoir list, something to look back and say to myself, "Yeah I remember her".
But I'd say I do recall/remember most of my rendezvous, the good, the bad and the non-reviewed ladies I've met.

dozen or so.  When you're just starting out, it's all new and wonderful, and you remember each girl and every detail.  Once you pass a hundred or two, it's all kind of a blur, but there are a few dozen exceptional ladies, including the providers I have had real life relationships with, that I play over and over in my mind, often as I'm drifting off to sleep.  I will never forget those special ones.  

I haven't had hundreds like some people, but I also tend to forget people, so I keep a spreadsheet and every once in a while I'll review it.  I do remember most, but some names now draw a blank.  

I will remember some, generally the good, much longer than others but I'm not trying to do so. And I'm not really one of those that is largely a one time and move on to the next. I'm largely living in the moment and looking to have a good time -- not create memories to live through later in life.

the girls that are favorites and I see multiple times.
But I do have memories of sessions that pop up once and a while that brings a smile to my face.

But overall I do have a good memory. There are some that stick in your memory without any effort either by virtue of being good or bad. If they don't stick in your memory maybe they weren't all that worthwhile or terrible.

the details of any date. I remember the women, and the impressions that they made on me - I remember the people.  

A gift from the almighty in terms of how our brains work.

hmm. I think I remember the bad experiences as much or more. There was a recent Hidden brain about the effect of the negative on us...Maybe this falls in that arena too.

Fester is such a freak.

Just like rats, cats, dogs, and frogs, we have the innate ability to adapt to different stimuli and we do so differently. Conditioned responses.  
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For example, when I see two posts such as those from mrfisher and LikeTearsInRain, I am conditioned to want to shove electrodes into their brains and measure the output before, during, and after good sessions and bad sessions and to see how they differ.  
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I would consider using MRI instead of electrodes but shoving electrodes into brains is more fun!

I would have preferred an anal probe, but nooooo, they were already beyond their quotas for those that day.

I have had so few negative experiences that the details of them tend to stick in my mind.  

Using an anal probe would distort the experiment. You would clearly enjoy it so much that it would likely mask or distort your sense of a "good" or "bad" session. (And LikeTears might hate it so much ...). Shoving electrodes into your brains would not interfere with the rest of the session and I wouldn't feel a thing.  
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Don't feel embarrassed about suggesting a bad experiment. There have been many other bad experiments that didn't measure the right thing.