No, it’s not a porn flick. It’s a 2000 book by Brian Southam about the English author and her two brothers, Francis and Charles, both of whom served in the Royal Navy, and how their experiences are reflected in Persuasion and Mansfield Park, among other works. Austen admired her brothers and almost all of her references to the Navy are positive.
Southam’s book is an interesting take on the Navy and its place in British society at the time. Capturing enemy ships and getting prize money was a major inducement, as it could lead to wealth and thus, to some extent, social standing. Bold and daring officers were generally rewarded, and the Navy was generally meritocratic, although Southam also explains how politicized it was. Francis, in particular, used political clout repeatedly to get assigned - or try to get assigned - to better ships. He missed out on the Battle of Trafalgar, which would have been a huge boost to his career, because Lord Nelson had just previously assigned him to convoy duty elsewhere (he was also later reprimanded for flogging his men too much). Charles lost a ship in a hurricane, apparently through no fault of his own, but it didn’t do his career any good, either. Both brothers eventually became admirals, well after Jane’s death, although in Francis’s case it wasn’t until he was semiretired, very old and hadn’t been to sea for awhile.
Southam also includes interesting bits on Charles Darwin and his studies aboard HMS Beagle, and the scandal caused by Nelson’s notorious affair with Lady Emma Hamilton.
Austen fans (and O’Brien fans, for that matter) might want to check it out.