Parasitic Tail Genitals (Cunksnake or Cockvine) block you from both
Bianca's and
Kimber's Sex menus.
However, Tail Genitals (Non-parasitic)
don't block you from any content.
Non-parasitic tails can be gotten in two ways (In current version):
Easy way: Get the parasitic version of the tail-genital and use either Catnip or Fox/Frostfire to change the tail and 'kill' the parasite.
No parasites way: Grow any tail. And take a
Tentacool pill, save scum until you get your wanted tail-genital.
EDIT: Also another easy (No parasite) way is to just use
Dicksprout on your tail (Quite clearly, this is only for Tail-cocks. Tail-cunts still have to use the Tentacool pill.)
I will also add that some
Tail-Genital content is locked to Parasitic versions only (Since the focus of those scenes are more focused on you 'losing control' over the tail).
Scenes like the 'Parasitic Drop' in the New Texas Cock Milker, Dally's 'Milking' Scene, etc.
I believe if it's parasitic, it locks you out of Yoma content.
I don't think that's true since
Yoma actually has a Tail-cock scene that's definitely written for parasitic tails (Even though you can still access it with non-parasitic tails, which I assume is a bug).
I believe you might be thinking of SSTD's since that locks Yoma content due to his fear he might give it to his master.