Perhaps you were just responding to the affection element of the video - licking is a sensual, comforting and as already mentioned affectionate act, regardless of where its done or who was performing it. Cantexplain is right - human sexuality is extremely flexible, i wouldn't read too much into the matter, there are all kinds of alternative porn out there - a friend of mine once knew a guy who got turned on by people having their heads flushed down a toilet (!)

Just be kind to yourself, we're all human and sometimes we need to give ourselves a break. Good luck