Here's a demonstration of proper front-side SSS, on the VSS figure on the left. The main light is from the right side. So the maximum SSS should happen around the shadow side of the terminator, which because of the light angle happens to be facing the camera, but a little to our left.

You can see it best in the abs on his belly, his left side, and also on his left thigh. It's also quite clear on the bridge of his nose. People notice my noses look really good - it's because of the SSS happening at the terminator.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)