Lately I've been hearing friends talk about loving on people. Here's an example of the sort of thing they'll say:
We should be working in the streets and loving on the homeless.
Forge relationships and love on your friends!
You can find specific examples of this usage by typing
"loving on" people into your favourite search engine.
What is the origin of loving on or to love on? Could it have been popularized by people who thought that loving or love weren't active enough for the context? (Loving on seems most frequently used in a religious context, especially when referring to good works.)
Of what use is the preposition on? It doesn't seem to change the meaning much—you can't physically love on somebody in the sense they're describing—and I've only seen or heard it used in contexts where love by itself would suffice.
I ran a Google ngram with input
love_VERB on, although I can't say for sure whether that's helpful.