I spent a significant portion of my childhood on the farm and learned to accept certain realities. Many would prefer not to know about the food and liquids they put into their body that I know. (It's an old fashion farm, not one of those factory types. Ownership has become murky over the decades, more than a century actually, now essentially composed of various properties that depend on each other and so in practice it's communally owned, which makes it very difficult to modernize...for which I'm actually grateful.)
All in all, not much grosses me out anymore. Though I did about freak out over some bizarre, hardcore porn I came across at 13, but I got desensitized to stuff like that later on. Kissing is nothing to me.