I believe the phrase in question is "Ikea Erotica". Reliance entirely on the anatomic terms can quickly turn a sex scene into "How To" manual, which bores the reader.
It should be noted there is a major difference between avoiding vulgar terms and relying entirely on technical terms. You can use phrases such as flowered, manhood, member, sex, etc., without having to sound like you're reading out of a medical dictionary on the reproductive organs. But at the same time, you might want to throw in the occasional cock or pussy. Sex is not a clean act. (Well, unless you have a few particular fetishes, I suppose. To each their own.) At worst its a bestial expression of lust, while at its best its an energetic and exhilarating declaration of love. Trying to hide that just seems...wrong.