I think sweet can have a bit of sensuality or "spice", but the main reason people like me would be looking for sweet Romances in particular is to have less sex scenes or less erotic material, etc.
It's like a "heat level" classification.
Has nothing to do with how "loving" a couple is. (All Romances should already automatically have love aka romance, anyway.)
I think some sweet Romances can also be classified as "clean" Romances (in Amazon, from what I saw anyway)...
The no-swearing part may not appeal to your tastes, but there are readers who do enjoy having less swearing in some of our entertainment.
(I myself don't mind some minor swearing, but I dislike if there are too many F-bombs, and/or some explicit sexual terms.)
Off topic a bit: I recently discovered that there are "cozy" mystery fans who are similar in wanting less explicit sex and violence, and sometimes less swearing as well. That probably explains why some of the mystery stuff I've liked in the past were "cozy" mysteries.