In early sixties there was the Russ Meyer's "Wild Gals of the Naked West", but that flick has quite a bit of (semi-) nudity in it.
There's a trailer on YouTube.
I think I've seen the movie You describe, but then again those two scenes were rather popular IIRC.
Or I just have seen a certain type of westerns
My timeline is different from Yours though, obviously, and when I was into westerns I didn't pay much attention when it was made, so those scenes I remember were probably from the later (spaghetti western) movies.
It must have been almost two decades since I watched westerns though, so don't take my word for it.
Our memories play tricks on us as well, as I discovered on my search for a certain Sci-Fi mini-series.