Rule of thumb is to avoid the word "because." You are not writing an essay question. This will avoid sounding dull and it will also add urgency. In a sense, you may be cramming a long portion of a sentence in an exhaling breath so this forces you to say it very quickly, which emphasizes that urge. For example: "You laying there naked makes my cock hard because I find you to be so irresistible." You may be feeling this, but this is a bit long. Try separating the fragments with breaths. Long inhale, "You lying there naked," quick inhale “Makes my cock hard" inhale "You’re irresistible." This style sounds more natural than mechanical, which is the intention of good dirty talk.