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.