I always use something, with smart phones now it's so easy to find porn, pictures ore someone to connect with or even cam with it just really helps to turn me on and makes the masturbation even more enjoyable
It possibly depends upon age. Older people will have been masturbating long before the Internet arrived so they will have not had the images/videos that are now available. Also, as a man gets older he may need visual/audio stimulation to help gain a full erection. That said, it is possible to orgasm whilst semi-hard or even almost soft.
I think the OP brings up a good point. I grew up in the generation before porn was readily available online and was too young to rent it. I had a couple playboys & penthouse mags which sure got their use but often times it was me alone with my thoughts. All that said I do wonder in this younger computer dependent generation if that is the case. I say that because my kids can't even make it through the day let alone a 30 minute car ride without having some electronic device of some kind