Have You Heard This One

A young woman traveling on business in the Southwest US, is abducted by two alien creatures, while riding along the interstate. She is examined, and poked and prodded and then united with three other humanoid females. A substance meant to lower her inhibitions, soon has our young captive, naked and engaged in a rollicking free for all with the three females she assumes are abductees also. The point of the 'drug' she is giving is to allow the alien's to observe human activity in its most uncensored form.
The alien captors have evidently seen enough and change the setting and the captive woman is paired with another single female humanoid. The intent of the aliens is to have the two engage in sensual activities for their own personal pleasure. Time is a blur for the young woman and the erotic nature of the forced activities have her forgetting her imprisonment and throwing herself into the struggle with her fellow captive.
Then just as soon as the situation gets interesting the young woman awakens in her car, along the interstate where she was first captured.