This reminds me of the episode of the Larry David Show when Larry overhears a conversation that makes him think (wrongly) that a woman he is meeting a restaurant has given her boyfriend a blow job in the car just before arriving. She goes up to him to give him her usual peck on the lips as a sign of affections and he draws away with a look of disgust on his face. She, of course, is completely puzzled by his behaviour.
It was a long time ago that I ceased to think about how many dicks had been inside a woman before I arrived on the scene. I just dive right in. After I cum, I go right back down again. I know, at least, how my own cum tastes. I supposed there might be other stuff mixed in. One special woman friend of mine is fond of saying when I kiss her, "Hmmm, I can taste me on you," and I like to say the same to her.