I wouldn't say it was gross but care should be taken when one is kissing another while sick with a cold or the flu.
To most people kissing is romantic but isn't it also gross? That people exchange saliva?
Kissing is a special bond that two people who love each other. I don't find it gross I find it attractive. I can't imagine having a girlfriend and me and her not sharing kisses. That would really blow me over because to me kissing is a special bond for me to let a girl/ woman know that I love her.
There are a number of types of kisses.
Many, involve no exchange of fluids at all.