The year this film came out, there were two distinct markets in America for sex movies. Many markets, like Atlanta, forbade hardcore films, even though they'd been "mainstream" for a few years. In other markets, there were venues for hardcore, including storefront theaters showing 16mm prints from the West Coast, plus soft-core venues, like adult drive in theaters. Many XXX flicks were edited down to just X for those soft-core theaters. Massage Parlor wife was a strange admixture. In the very opening scene, Serena is seen administering to a not-bad looking side-burned dude and you see what appears to be a huge erection under his modesty sheet. Softcore movies would have been pushing the envelope at that, but by '75 they might use a prosthetic to achieve that effect. But Serena finally pulls the sheet down, it you get to see a fully erect, large penis, which she grabs. For a XXX movie, very tame. But for a sexploitation soft-core outing, daring. The scene with Serena getting oiled up and spun around featured wide open beaver shots, normally not found in soft-core outings. But as a previous review points out, the height of this "taking it to the max" sexploitation occurs when the protagonist...watching his wife in a threesome from a hidden closet, finally reveals himself. He is glistening with perspiration and fully erect...daring enough in and of itself. But obviously, he'd either been 'fluffed' or had masturbated to the point of climax immediately prior to his coming into scene, because his phallus jerks up and down as he stands with his hands on his hips, proudly dripping a glistening line of semen onto the floor. The movie would have been less erotic in full blown hardcore, but by pushing the envelope this way, with very close- to-hardcore footage, it's a stand-out. Wish there were more films like this one.