Deontay Wilder's GF Says Boxer Ain't Superstitious, We Bang Before AND After Fights!

[[tmz:video id="0_2o2gdm0f"]] To hell with your "science" ... Deontay Wilder gets freaky with his GF whenever he wants -- even BEFORE huge fights ... so says his girlfriend herself. Of course ... TONS of fighters abstain from shagging before big bouts --…