I saw part of this movie on Movie Channel back when I first got cable in 1983. They would show rated R movies in the afternoon (this one was on a sunday afternoon).
The cartoon reminds me of Ralph Bakshi but cannot find it in all the sites I’ve looked on. One afternoon they ran some films like American Pop – Rock & Rule and Hey Good Lookin’. I scanned through all of those movies on YT however could not find the scene that I remember.
The only thing I remember is that there may have been a dream sequence. There was this very large naked woman who was teasing a man (who was small). She picks him up and then in some way shape or form he either slides down her or he slides out of her vagina (???). I don’t think I ever saw this movie on cable again.