Read women writers. That's naturally a generalisation but I've found in my reading of SFF that women writers are much more likely to have romantic thread plots than men. For specific suggestions:
Anne McCaffrey
Lois McMaster Bujold
Mercedes Lackey
SL Viehl
Elizabeth Moon
Guy Gavriel Kay (yes, male)
Tanya Huff
Catharine Asaro
Enjoy!
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