Article continues below advertisementTaylor Swift opened up about the inspiration behind her steamiest track yet, "Wood," which is believed to be inspired by her fiancé, Travis Kelce."I brought this into the studio and I want to do sort of like, do a throwback, kind of timeless sounding song and I have this idea about like, 'I ain't got to knock on wood' and we would knock on wood and it would be all these superstitions," Swift, 35, explained during an appearance on The Tonight Show With Jimmy Fallon on Monday, October 6.