SunnyD
Belgian Waffler
I do think it was probably inspired by the Gaye song but it's not actionably similar.
This.
In fact, the latest Rolling Stone column about it cites 3 Thicke songs that supposedly rip off Gaye. I listened to all three of each. I found all three songs significantly different from each's counterpart.
Was Thicke inspired by Gaye? Probably. But he didn't "rip off" Gaye at all, at least not in a Vanilla Ice sort of way.