The offence of sexual assault encompasses a wide variety of behaviour and what's called the actus reus of the offence, which is the actual act and not the intent involved. It encompasses a wide variety of behaviour, which can be determined on the basis of circumstances: things said, what is done and in what context, and what the relationship is between the two. So in fact, depending on the circumstances, yes, where there's no consent, an indiscreet and inappropriate kiss at an office party can be deemed sexual assault.
On April 23rd, 2009. See this statement in context.