Characters are identified as lesbian or bisexual, either in main-text, via short story arcs, mentioned in conversation or implied/teased (and often shows double-down by heavily featuring those moments in trailers or promo pics).
However, their same sex attraction is not explored on screen: either never shown or, in the few cases in which they have a same sex love interest, their interactions are downplayed, written off as heterosexual opportunism, are censored, or they happen off-screen.
“Homosexuality is still a taboo in much of the world, and while some audiences may tolerate a gay character, they may be completely squicked out by shows of affection and sex scenes with gay and lesbian characters, no matter how tame they may be. So television shows and other media don’t push the envelope too much on gay affection. There may be a hug, or a meaningful handhold, but never a kiss unless it’s heavily promoted and advertised (and even then, don’t get your hopes up that it will happen as advertised). So basically, you can have gay people and gay couples but they can’t be shown actually behaving like a couple” — TVTropes.
