premise: A couple kissing while going up the escalator. hypothesis: The husband and wife were feeling sexy as they completed their shopping at the mall.
neutral: The escalator could be anywhere, nothing infers that it is at a mall.  The couple could be on the escalator at any time, there is no way to know if they are shopping or not.  Just because a couple is kissing does not mean that they are feeling sexy, they could be feeling anything.