Vintage 70's/80's- At least four sisters are their sexual escapades.

I'm trying to find the name of probably the very first pornographic video I ever saw, along with Flash Pants and Beverly Hills Exposed.

The image has nothing to do with it, AFAIK. It's just a placeholder for a retro pornographic company.

I have no idea when exactly it was released but I guesstimate late seventies to early/mid eighties (I watched it in the late eighties or early nineties), nor do I have any idea who made it or who starred in it.

I remember a couple of scenes that I hope is enough to jog someone's memory.

The general premise is a luxurious home with a father and at least four daughters. Maybe five. Two of them are twins. They are Caucasian.

First scene- A girl wakes up and it's her eighteenth birthday, I think. Her boyfriend sneaks inside her window and I remember her riding on his back like he's a horse. I think she tries to hide him and succeeds when she hears her dad at the door. Can't remember if there was sex.

Second scene- The birthday daughter and a sister are bathing together which leads to a shaving scene and I think cunnilingus.

Third scene- One of the sisters has sex with the trash guy in a pile of trash after he either dumps trash by mistake or she gets into an argument with him and throws trash at him. Trash guy was black.

Fourth scene, the father and his girlfriend, maybe wife, ends up having sex on the hood and windshield of his Porsche or Ferrari. It's an expensive sports car.

Fifth scene, the twin sisters are in the garage with their biker boyfriends. The video cuts off at this point as it ran out of room on the VHS. The last thing I remember was a balloon popping, and one of the sisters saying something stupid and pun-like. "That totally blew my mind!" or something like that.