i was going to suggest Harry Turtledove books but they have slightly more detailed sex scenes and I geuss that counts as romance
HT writes alternative history essentially "what if" kinda thing, his most famous ones is a series based on whether orders Lee's Battle orders 122 didnt fall into Union Hands allowing Lee to win key battles. Brittain and France at this point recognized Confederate independance and forced the US to recognize it as well. The book series continues onto WWI, the interwar years and now WWII.
He also has a few other books series, I liked "Days of Infamy" which is a realistic scenario where Japan actually seizes the Hawaiian islands with troops not just raiding it, a sequal is out now I think for it. Lots of cool fighter scenes.
Another book is his "World War" series which is partly scifi, where in 1942 4 foot tall eguana aliens from Tau Ceti system invade earth forcing German, Japan, USSR, USA, and GB to work together to stop them. Has a "Colonization" series as a sequal which covers the 60's and now has another sequal that covers 2004.
Though the Book Samurai! by Saburo Sakai is also good, its partly his memoirs partly an "historical novel" its about his experiances as a Japanese fighter pilot in WWII set as a novel rather then a journal. LOTS of cool fighter combat.
But ya, I'm pretty sure Clancy's only good books were Red Storm Rising and Hunt for the Red October.