Marvin Gaye has never sounded so sexual. We reckon it's on account of there being an extra man involved in the form of Steve Carell. This is no ordinary Ragtime Gal barbershop quartet, it's a quintet don't you know. 

Why, yes, the lyrics could be considered extremely illicit when not draped over Gaye's velvety tones, and as for Fallon making that popping noise, well, that's just going above and beyond... *fans self*