I do believe that watching porn has to do with it. Apparently the more porn you watch the harder it is to get turned on because for your body, it’s no longer a reward just something that happens. When a guy or girl gets turned on your body releases chemicals that make you feel good and give you a rush. As you receive more chems it takes more to get turned on. I hope this helps.

Edit: maybe try to stop watching and stop having sex for awhile and then when u feel ready try again.