I have a very sad movie that is called "ein lange ritt nach eden" its a 70 softcore german western, there´s not mutch to see, maybe some boobies that come in the screen.
Im waiting on "brand of shame" also softcore, there is also a brasilian hardcore porn western were our friend django is the mean star.
and ofcours "porno-erotic western" but I believe its never released on vhs or dvd.
a dirty western is still available on dvd.
these are the "sex" westerns that I know