In the past, I've used a lot of "throbbing dicks" and "inner walls" and other such descriptive words and terms that will quickly add up and clutter the sentences and break the flow during a crucial (or the central) scene.
My current writing shows efforts to move away from describing in favour of showing and painting what my characters feel. In a romantic context, what is paramount is what the lovers feel for one another.
In my next chapter, there will be a scene of incestuous sex between brother and sister. I'll have to think of all the emotions the two of them go through, and how on earth they end up having sex in the first place. My male character will be gripped by the enormity of what he's doing and become a prisoner of what can never be undone. I don't want to describe bodyparts here; I want to depict emotions and the sense of extreme transgression mixed with extreme sexual pleasure as well.
In other contexts, such as a glamorous, well-dressed woman who gets gang-fucked by sweaty boxers in a seedy downtown gym, words such as "dick", "cunt" will be perfect to convey the atmosphere where a bunch of motherfuckers are whoring that lady who now feels like a dirty slut as she takes their jizz inside and all over her -- and she loves this.
If the words you are using are contributing to your story on other, deeper levels or intensifying something meaningful, then your run-of-the-mill words will produce a more powerful effect, much like pawns occupying a key position on a chessboard.