So this has come up a few times along with a few contradictions within the same core rulebook so this post is in a question and answer format.

The Sept of Strange Waters is already weird for having allied themselves with other supernaturals. It is unnatural to be working alongside Vampires and all the other Nightfolk whom most other Garou in the world would love to tear apart.

This means that the Sept CANNOT allow members of the Sept to have romantic relations with other supernaturals, because if they do, the rest of the Garou Nation will come down on the Sept and absolutely destroy it. And then they would go on to add it into the Litany that no Garou can ever become friends with other Nightfolk.

Pretty much, just stick to Kinfolk and normal humans/wolves.

They turn into a big furry rage machine with claws tearing stuff up. Seriously, there is no way to tell if a kinfolk is trueborn or not until they either change or don't. The book contradicts itself on this matter and it has even changed from Revised to W20. The STs have decided this will be best (As a note if a kinfolk mates with a garou and then changes into a garou, that does not make a metis. Just an uncomfortable conversation.

Well you are both going to have to make stamina rolls. The difficulty ranges from 3 (No protection and screwing like rabbits) to 10 (It would literally take the 1 in 1000 chance of things going wrong for it to actually happen). If you reach 5 successes between the two of you…you'll get a nice surprise.

With that being said, since we have no intention of forcing you to roleplay a pregnant kinfolk (Or female character etc. whatever) for nine IRL months, we are handwaving it time-wise for pregnancy so that it takes 15 weeks. You'll be given your schedule so you know how far along your character is and can roleplay accordingly. If one or both of you is a mad lad who took the Black Fury merit “Unusually Fertile” guess what you get pregnant at 2 successes.

• If the male botches you made him pull a groin muscle you're going at it too hard!
• If the female botches she gets food poisoning at the exact moment she thinks she should get morning sickness (i.e. false positive)

Pure bread is a mark of a hero, even if the Garou is a Black Spiral Dancer you will be hard pressed to resist them! Keep in mind the respect-demanding RP impact of Pure Breed (They smell like the garou heroes of old) as well as the mechanical impact.

Mechanically, Dots in Pure Breed add that many dice to your social rolls against another garou (Or another garou's social rolls against you).

Pure Breed does not have any impact on your training and physical ability, so pure breed never adds dice to physical rolls.

In White Wolf's Canon, a Silver Fang with 5 dots in pure breed actually betrayed the nation and his tribe had difficulty rising up to excise him because of his pure breeding. That's how powerful it is in an RP sense.

From W20:

  Garou take great stock in ancestry, and the werewolf
  who is descended from renowned forbears has a definite
  advantage in Garou society. This Background represents
  your lineage, markings, bearing and other features of birth.
  Other Garou revere werewolves with high ranks in Pure
  Breed as heroes of yore come to life — and such werewolves
  are expected to act the part. The higher your Pure Breed
  score is, the more likely you are to impress elder councils
  or receive hospitality from foreign tribes.
  ...
  Pure Breed is a nebulous combination of bloodline and
  spiritual inheritance. A character with high Pure Breed
  looks and carries himself like an archetypal member of
  his tribe — however, if he does not join that tribe, any
  benefits of Pure Breed are removed by the tribe’s totem.
  Many werewolves with Pure Breed can trace their ancestry
  directly, while others resemble distant ancestors who
  cannot be connected without a degree of genealogical
  exactitude that is lost to the Garou.
  Some tribes place more value on good breeding than
  others, but Pure Breed is almost universally respected.
  It’s a mystical trait, and werewolves can tell instinctively
  whose blood is particularly pure. Of course, Garou expect
  those of pure blood to live up to the standards set by their
  noble ancestors. They frown on those who can’t or won’t
  accept the challenge. 

Because the thrall invites the Defiler Wyrm into the heart of the Garou, it causes them to either rage as a homid or a lupus born garou. There is a 50% chance the Metis will fall to either the Homid or Lupus thrall instead. The Metis thrall is removed (And ffs White Wolf, should never have been a thing)

Also the sourcebook Rage Across the Heavens is banned.

Based on a discussion with the STs, Ancestors now works for the entire scene due to the inherent difficulty of the roll (And not being overly likely to get a bunch of dots added)