Haven't been able to track this title down anywhere. Mid to late 90s soft core on late night Cinemax. Believe couple is taken hostage by convict and eventually his girlfriend. There's a scene where convict is doing his girlfriend on the back of his car right next to the interstate. Another scene where the kidnapped couples are pouring syrup on each other while having sex, and another scene where the kidnapped woman has written help on her chest in red lipstick and shows it to whoever knocks on the house door trying to give the person a clue while the convict is behind the door listening to the whole conversation