I might let my parents or close friends take a sip of my drink, but that's about it. The drink is mine. Same with food. Parents and close friends can have a taste. But if they want to eat more than that, then they should get their own food. If they want to eat my food, then they should warn me beforehand so I can make a larger portion.
Yeah, sure, as long as they don't have some kind of disease or an low sense of hygiene. When we go to a restaurant me and my friends always decide together what each has to take, to try a bite of everything.
HELL NO ! It's my food/drink go get Your own ! Food is private, intimate... unless it's Yours than You have to share it ! <--- That's the Scooby-Doo rule ! Live by it! ... I mean I live by it You live by " share with me" rule. :D
I wouldn't just in case they have mono. I know because that is how I got it when I was in my early 20's and it led me to develop another disease from my low immune system. You don't want it, rather be safe than sorry.