Have you ever noticed that Cait continues to say, "Next person who asks me to shag is getting a well placed kick, if you get my meaning." even after you've romanced her? In fact, she says it right after saying things like, "If yer feelin' tired, we could always find a bed," or "Well, hey there handsome/beautiful." sometimes. Hell, sometimes she'll even say it right before you sleep, and then say something implying you "shagged" when you wake up! Maybe she's just referring to Dean Martin's Fetish and she's actually going to kick you in the head rather than the balls/vagina, but she sounds pretty pissed when she says it. Even if that were the case, its a pretty weird thing to be into granted this is the nexus and there are a million weird fetish mods here. 

FAQ:

Why are there no pictures?
Because this mod doesn't really need visuals.

Even in that paragraph long rant, you never stated the exact purpose of the mod.
It's in the title. Cait will stop threatening to kick you in the genitals after you've romanced her.

...But why? Haven't you noticed that Cait is a stone-cold bitch with no tact whatsoever?
Don't insult Cait. She's the best companion in Fallout 4 and you goddamn know it. Besides, she says suggestive things that make it pretty clear she wants to "shag" when you've romanced her.

You're only saying that because she's attractive, aren't you?
That and because she has no tact whatsoever. That's better than a kick in the head.

That's a weird thing to put in an FAQ... did people even ask these questions or are you just making them up, you fucking weirdo?
You'll understand when you've been using Creation kit for a while.