My boyfriend says i smell/taste good during oral. i took shower yesterday morning (every day), apparently yesterday night i randomly had no smell/taste at all, it happened 1 time prior. he thinks i cheated cuz no taste and no smell. what causes this?

No mucus that day: Most likely explanation is that you washed thoroughly or perhaps more thoroughly on day in question. More than usual & your introitus (space between labia) was dry because there was no mucus produce by the mucus producing glands in the area. This will happen more & more often when you approach menopause & mucus production slows down or stops.