Hi. I am looking for an old pornographic film that I watched many years ago. I still remember a few scenes. Perhaps someone can help me find out the film name?

At the begining, a women with big breasts is having a bath in a bath tub, and then she sits on the edge of the tub and starts masturbating herself with a towel. After masturbating and finishing the bath, she sits in a bed and writes a letter to someone. In the next scene, two bussiness mates are having a phone call with each other probably talkaing about their future business. After the call, the scene shows that the man number 1 is having a blow job by a woman who is doing the job under a desk, and man number 2 starts having sex with a naked woman.
In another scene, this big breasted woman comes to see the two businessmen and gets hired to take adult photos. And the man number 2 promises to this woman that nothing violating would happen or something... Then this woman along with another 2 women start being taken photos by man number 2, and this man even gives some adult toys to the 3 women to play with themselves so the man number 2 can take more insteresting photos.

And one day, this woman finds out that something is not right, and then she starts to collect evidence. And finally she catches man number 1 having sex with one the 2 women that she was having photo shoot with.

Can someone help me? Thanks.