Bill Loose did a handful of original music scores for adult films in the late 70's and early 80's. This was one of them. He was also one of the very few that had the balls to put his real name or publishing company on the credits.
Sometimes he would "recycle" older music selections from other non-adult projects and put them in the X films combined with the fresh material if budget was low (much like my good pal Dick Hieronymus did when he scored X films on limited budget back in the same era).
But with this film being directed by Bob Chinn who usually worked on the good budget ones, it may be an original piece that doesn't exist outside of the film music session reels in a vault somewhere.
However, you never know. Loose had been known to licence stuff to libraries back then from his original nature documentary scores, so maybe this tune could be sitting in one of the long lost obscure libraries he delt with, like Timbrewood Production Music or one of Don Great's old tape reel only music libraries.
I have some of the Timbrewoods from this era of Loose...when I get a chance i'll dig em out, maybe later today, and have a skim through and see if this cut turns up. Will let you know.