DIRTY SUSAN is an above-average sleaze-fest in terms of the 70's/80's NYC porn scene. The girls are a little hotter and the sex is a little better than some previous entries. The storyline is a little less involved than other McCord mystery entries that I've seen (which was a little disappointing...) but the strong sex scenes balanced it out.
This one has McCord on the trail of a mysterious girl named Susan that seems to come and go through people's lives when they are having sexual problems. Just so happens that this "Susan" is the same girl who ended up in McCord's bed just that very morning. As McCord gets to interviewing witnesses about this strange girl - we find that she's a sort of ethereal sex-therapist of sorts that finds people in need of sexual help, and is more than "helpful". We hear stories of a couple who Susan advises to have the wife bone her brother to fix the problem (?!?!?) and another girl who needs help with her first lesbo experience. McCord realizes that if Susan doesn't want to be found, and gives up the search, in turn suggesting that all of those "touched" by Susan's helping...uh...hand - get together for an orgy. Sounds like a good idea to me....
Again, the story in DIRTY SUSAN is pretty weak, comparatively speaking, and doesn't make a whole lot of sense - but you'll be too busy reachin' for the tissues to worry too much about it. If you dig this one, I also recommend SLAVE OF PLEASURE - another Dan McCord mystery with a better storyline and some hard S&M action towards the end of the film...7/10