I ended up finding an audio cassette tape where when I was in my late teens / very early 20s where I recorded about a dozen and a half sessions of myself jerking off fantasizing to girls that I knew at that time. At first it was strange hearing my voice on the tape and talking about the girls and what they would doing to me. But the funny thing is I remembered each and everyone of them. I remembered being in my bedroom and I would spread out pictures of nude women or just really hot pictures from the newspapers or magazines that I found, on my bed. I must've used some kind of lubrication whether spit or handcream because I could hear my hand stroking up-and-down on my stiff Boner and then eventually I could hear myself announcing that I was "going to Cum", and hear the splat of my sperm shooting out and hitting the picture(s) laying on my bed. I could tell how intense the orgasm was by how loud the cum shots were hitting the picture and by how much of load ejaculated out. Also on several recordings I could hear myself comfortably moaning just before orgasmic relief. It might sound a little weird, but after listening to all the recordings on that cassette tape, myself extremely rock hard and horny for whatever reason.
I think you should record it about 30 or 40 years ago some date in between 1980's or even later. I recorded many times but I have keep them, I wish I had one of them.
Masturbated in the 60s with pictures from newspapers and lingerie catalogues spread over my bed but can't remember ever recording them till camcorders were invented, very erotic watching yourself cum, but would be embarrassed after and delete them,
In the 60s my mom was a member of a fashion clothing catalog French magazine named "Bourda" which contained tremendous pictures of panties, bras, stockings, high heel shoes, undies.......with the picture of many young sexy models ladies. She kept the magazines on the upper shelf of her bedroom. To access the magazines I had to go on a high chair when she was not at home. She used to go to our neighbor's home to have a tea gathering with the other women, so I was sure she would be out of home for a couple of hours, and I got one of the magazines to go to the bathroom to wank off before she came back. I did it almost a couple of days a week.