Of course he's doing something right (it just isn't what he's doing at the moment). But its a tell-tale sign when your girl can get easily distracted while she's getting lapped.
On a side note, I noticed that both will give each other head but only for a few minutes (as if its foreplay). Then they'll stop and find something else to do (smoke, iPhone activity, personal grooming, watch TV). It could be hours before they resume sex (or fall in that same pattern).
Generally speaking (not necessarily directed to S&J), WTH is with this generation where romance and sex don't deserve attention and/or quality time?!