I'm fine with sharing a straw/cup/soda ect... with my sis, *maybe* my dad, but most def not with my mom (mom smokes cigarettes). Thou my sis and I try to sip from different straws or different parts of the rim, if it's an option.
Years ago my BF at the time took a sip of my drink from the straw without asking. I was grossed out. To him it was fine. I got up and changed the drink and straw out entirely. That was the last time he did that (thank god). I mean I get it if it's with your dating person/partner/spouse whatever cause kissing and all, but I actually don't like kissing, esp on the mouth, so that extends to me not liking parts that touch the mouth like rim or straw being shared.
Years ago my BF at the time took a sip of my drink from the straw without asking. I was grossed out. To him it was fine. I got up and changed the drink and straw out entirely. That was the last time he did that (thank god). I mean I get it if it's with your dating person/partner/spouse whatever cause kissing and all, but I actually don't like kissing, esp on the mouth, so that extends to me not liking parts that touch the mouth like rim or straw being shared.