Unless I'm an active participant, an hour and a half of non-stop sex is just too much, and if unimaginative, it makes it difficult to view.

An interesting germ of an idea -- paintings that cause sexual stirrings in woman -- is quickly killed off by repeated couplings with nothing to get the viewer hot beforehand.

The only actor who comes close to acting is Ron Jeremy.  Guys, don't waste time with dialogue for these women. They were obviously cast for tits and banging... which they have and do. The latter in a not-so-great, mundane style.

Technically, Heather Hunter On Fire isn't bad, but more variety, creative camerawork, and nicer sets would be nice. And vary the gynecological shots! Hot packaging, but certainly not a tape on fire.