i barely remember this film but its buggin me everyday.

A couple are kidnapped. One is quite a guy who is unattractive and his fiance/wife is young and good looking. There is a scene where she has sex with one of the kidnappers (not sure there might be 2 of them) while the husband is tied up on the floor. I remember the end where i think she shoots of of the kidnappers and at the end the woman and her partner are sitting in a room with someone talking about his inheritence and that she will get nothing of it and they are to be dirvosed.

Very vague i know. searched all over for it.