May not be the right place but here it goes. One of my brothers passes or get extremely tired if he sees porn. Even a sex scene in a movie he has to go lay down. Is there something wrong with him?
And no he does not masturbate to the image. I am pondering of either seeing a psych doc with him or his PCP. Apparently this has been going on for the past 2 years.
Other responses so far are valid but as someone who has known people with this kinda reaction to sex stuff, they had cptsd from sexual assault as a child. It triggered them. Things from childhood can pop up later in life. Or maybe a recent experience could have.
Or it could just be blood pressure. Idk. But wanted to give you my experience and knowledge.