I'm sure people just kiss each other. I'm sure that sometimes you're talking and somehow two people move closer and closer to each other and then, they just kiss. I'm sure it happens all the time. But I'm also sure that a kiss is never just a kiss.
Im sure... That a guy doesn't like a girl that wears a bull's jersey all day with sweats on. Wears her hair in a bun all the time without make-up. Im sure.