Dirty Talk is imagined as a stand-in for a Confidence stat. The idea is that the higher the Dirty Talk, MC will go from a timid, "dead fish" lover to having the confidence to saying dirty things to his partners that causes them to say equally dirty things back to him in response (which is where the true value lies, imo). As is, the skill is underdeveloped and only implemented in a couple of scenes [Meredith BJ, Meredith Titjob, Lucy Cowgirl].
Of note is that Dirty Talk II is required if you want to give Lucy an orgasm during her scene. Each girl will have a "trick" to give them an orgasm.
I've had limited success recreating the sounds when sliders are off. I notice it happens when opening up the Quest Journal, you hear the Velcro scratch sometimes, but not always. I suspect this is going to be a difficult one to isolate and fix.
Belated Merry Christmas to you and Happy New Year! I hope you have a wonderful 2023!