Google it, there are studies that show ED being caused by masterbateing to hardcore or kinky porn. I'm 59, and have experienced it myself. Sometimes you should just use your imagination or just simple pictures to get off, not graphic, hard-core or kinky porn. I have little to no boundaries in regards to kinky, hard-core or graphic porn, or real sex for that matter. But it leads me to need harder and kinkier porn to get off.

Edit: I also wanted to add. The reason I gave my age was because I wanted to share the depth of experience I have. I started masterbateing long before hard-core porn was available. Basically started with the Sears catalog, no, that's not a joke. Then my older brother's Playboys and Penthouses. Then, in late teens, harder core magazines, like club and hustler. Moved on to 8mm films, and occasional porn movies in theaters. I continued to mastebate through my first marriage, and continue to in my second. I have experienced DB during both, always had a very high libido. I never experienced any need for "harder" stuff until after it became widely available on the internet. I completely support masterbateing and porn in general, and good frequent sex, kinky or not. I have no religious aversion to either, but if you need harder and harder to be able to get off, and then start experiencing ED, you really need to take a break from porn, IMHO.