Pictures of people kissing are perfectly safe for work, even if you happen to work at a Church.
Things that may not be safe to view in some workplaces include erect penises and nipples, pictures of intercourse and deforming diseases, close-ups of genitalia and corpses. And any and all pictures of Paris Hilton, because - keep that shit away from me. You may also LJ-cut the words fuck and cunt if you so choose, although I certainly wouldn't. But there's no need to put NSFW warnings on two lines of text that might potentially offend someone, somewhere, especially if you're posting to a community where the subscribers well know what to expect. People of metaquotes, I don't give a shit if what you're metaquoting happens to offend one-legged drunken circus clowns, I just want to read my flist without having to click on needless LJ-cuts all the fucking time.
In fact, I don't want to do that unless what's behind the cut features one or more of the things mentioned above, or large pictures and chunks of text.
And drawings of two people kissing that show nothing from the shoulders down? ARE SAFE FOR WORK. Even if said people are tongue-fucking like it's an Olympic sport. You do not have to fret like you've just made the biggest Internet faux-pas, ever, if you forget to cut something that doesn't even warrant a cut in the first place. What you have done, is cheat me out of my promised porn.
And you. If you work for the Westboro Baptist Church and think you might lose your job for using your working hours to surf on Hottest Swedish Gay Porn Ever.com or hardcore_bt, that's your problem, not the rest of the Internet's. If you don't want to lose your job, then cut that shit out. Stop reading your Eljay at work and DO SOME ACTUAL WORK.