I'm not sure I understand the question fully, i can say that it's an important part of the story for most of the paths although I do allow to not see any if you don't want to.
There are 5 "main" paths a player will be able to take (eventually) and it's probably secondary for 4 of the 5. It can become the main focus on the 5th though.
OK what I mean is, some games, with adult tags on sites, using RenPy and the VN format.... are NOT 'Adult' in the true AVN sense... they have Adult content, but a lot of people think Adult and Mature are interchangeable in this context. That Adult means ... say Adult themes... however, in media retail in most jurisdictions, Adult means Adult like Adult Bookstore, or Adult Film.... that is, the explicit sexual elements, are the CORE defining nature of the media. This is why in many places they are only able to be sold or screened in specific dedicated locales. It is also why many places mandate that such media as games MUST be tagged, either in copy, or their site listings on site, as such.
Thus, when I see an interesting game using the RenPy in the VN format, which has Adult tags, I used to assume it is an Adult game... adult in this instances meaning the proper definition in the context... only to find very often such was NOT the case. The sex was token, a narrative device, and not an integral part of the game (which also meant that usually, it was also the weakest element of the game).
I wish to avoid being 'burned' if you will, too much, you know? I play AVNs, and I play them for the A bit. I like games were that is a big part of the story, and like to avoid games which have the Adult or Sexual Content, or NSFW tags because they HAVE to, but there is actually only little moments of token or doggy treat sex which has no impact on the story at all in any real terms, and can be avoided.
So I was just curious as to which this was.
