To add to what Flying Squid said, Andrew Robinson wrote a biography of Garak (and his up bringing in the shadow of Enabran Tain and his education by the Obsidian Order). In that book, Garak is VERY bi and there’s strong hints that he could have been in a poly triad with a Cardassian boy and girl in Obsidian Order school… if only their loyalty and duty to the state hadn’t complicated everything.