Looking for an early 2000's movie where a grief-stricken man goes to a cabin where he has an affair with his best friend's lesbian sister.

I have seem almost every lesbian film ever made ..lol..so i am determind to get this.

Would you say this was a lesbian film, or probably a straight film where her sexuality is mainly spoken about.   Was it a TV movie or a cinema release?   Any clue on the actors i.e what else they may have been in?