That's an embarrassing question, so no real need to answer it. But... men, ahem, like to imagine sometimes, well, naked ladies. As a substitute. When they don't have a partner and no pornography. But people with aphantasia can't imagine anything. This sounds like a significant practical hurdle. Is it? (Unless one thinks masturbation is bad anyway.)
Edit: this comment is shadowbanned, apparently because of a keyword filter.
Speaking for myself: I don't miss what I never had. But I can remember or imagine sensations, which seems more relevant to me anyway? (Again, I can't compare to what I've never experienced.)
It's an interesting angle to investigate though. Eg is there a reliable or at least common connection between aphantasia and response to porn? Again speaking for myself as someone with pretty total aphantasia, visual porn does very little for me. I guess it did as a kid, but I think that was more about finding things out? Video can work, but only by communicating actions that appeal to me. Most of it seems almost entirely pointless; I had never considered the possibility that it's because vision isn't as connected to experience for me as much as it seems like it is for most other people? I guess I've just always imagined that other people were better at relating to the experience of the people in the images or videos.
Edit: this comment is shadowbanned, apparently because of a keyword filter.