beloved — A beloved person, thing, or place is one that you feel great affection for.
darling — You call someone darling if you love them or like them very much.
dear — You use dear to describe someone or something that you feel affection for.
dearest — You can call someone dearest when you are very fond of them.
escort — Accompany (someone or something) somewhere, esp. for protection or security, or as a mark of rank.
flame — burning gas or vapor, as from wood or coal, that is undergoing combustion; a portion of ignited gas or vapor.
inamorata — a woman who loves or is loved; female sweetheart or lover.
inamorato — a man who loves or is loved; male sweetheart or lover.
paramour — an illicit lover, especially of a married person.
petitioner — a formally drawn request, often bearing the names of a number of those making the request, that is addressed to a person or group of persons in authority or power, soliciting some favor, right, mercy, or other benefit: a petition for clemency; a petition for the repeal of an unfair law.
casanova — Giovanni Jacopo (dʒoˈvanni ˈjaːkopo). 1725–98, Italian adventurer noted for his Mémoires, a vivid account of his sexual adventures and of contemporary society
don juan — a legendary Spanish nobleman famous for his many seductions and dissolute life.
lothario — (sometimes lowercase) a man who obsessively seduces and deceives women.