This Padre Peregrino has come up in two separate threads lately. Somebody posted another article by him recently where he was complaining about how the French Revolution was allegedly taught in Catholic schools (which did not jive with my memory of how I was taught it in Catholic school) and saying he prayed every day to be a martyr.
“Padre Peregrino” is actually Fr. David Nix, a priest who has had a lot of conflicts with his diocese/ bishop since being ordained. Here is one of the more recent situations:
https://www.catholicnewsagency.com/...s-letter-responding-to-claims-by-priest-89419
Regarding his list of so-called “mortal” sins, first of all a mortal sin must have 1) grave matter, 2) full knowledge and 3) willful intent, so since he can’t just assume everybody has 2) and 3), the most he could say is “these are grave sins”.
Second, while some of the stuff on his list such as masturbation and fornication are understood to be grave matter, he is making some pretty sweeping statements with respect to “leggings/ short shorts” (leggings for example might be fine if worn under a skirt, worn by modern dancers, worn as gym wear, etc.), and his discussions of marital acts and unnecessary Sunday work are not strictly in accord with the teachings of the Church.
This priest is like Fr. Ripperger, he has some strong opinions on certain things above and beyond what the Church teaches. Rather than read his stuff, you should read the Catechism, and if you still have a question, you should talk with your own priest. I would not trust Fr. Nix as a reliable source.
I see by his bio he is currently working on his rule to become a diocesan hermit, and that might be better suited to his personality than being a diocesan priest. Yes, he’s “intense”.