Something that I've figured out is that, for a lot of places, religion plays a very big part in sexual matters. Shintoism, one of the two main religions of Japan, is very lax about sexuality compared to a lot of other religions so, as a culture, they've got no real reason to be against sexual content as much as other places.

Well, that's probably because Shinto isn't really a religion, at least as most would understand it. It's more of... it's difficult to describe, because, while, yes, it is primarily a methodology of interacting with the supernatural, it doesn't really concern itself with morality or the hereafter.

It's kind of a secular religion, if that makes any sense. Basically, take Steve Irwin's attitude towards nature and apply it to super-nature. That'll give you a rough idea about what I mean.

Religion is religion. As Wikipedia makes it easy to understand without needing multiple paragraphs because I talk in circles, "Religion is any cultural system of worship, including designated behaviors and practices, world views, texts, places, ethics, or organizations, that relate humanity to the supernatural or transcendental."

The key part of that whole statement is the "Or." Not all religions need to include similar themes to be classified as "Religion."
It doesn't need to share any similarities to what is commonly practiced in English speaking nations to qualify as a religion.
Also, Shintoism is pretty spiritual.

There's the key bit though. Shinto isn't about worship. There are offerings and such, but it's not about deferring to a higher power. It's about getting the local spirits to play nice or leave you alone.

It's like leaving bread and honey out for the brownies vs. a burnt offering to Apollo. The former is not worship, the latter is. Shinto is about the former, not the latter.

Spirituality does not equal religion. Theology and mythology are one of my nerd fields, not my strongest, but it is.

Speaking as a Pagan, it's all the same, Leaving an offering is leaving an offering. Worship doesn''t have to be kneeling and gorveling. Giving an offering and being respectful is still religious. QUit trying to nitpick and separate.

It's not nitpicking, it's pointing out fundamental differences that are one of the primary reasons why the religious landscape of Japan is so freaking weird compared to the rest of the world.

Mind, I have... things to say about what passes for Paganism in this day and age, but, as I said, rules.

It's not really a fundamental difference.
However, I care so little that I'll just agree because it's not a topic that interests me.

I mean, by that logic those guys should just do that every crossover and be done with it : P

Honestly, they should but then what would we do for the rest of the movie?

Well, there's a reason why every Taisen picks about 4 or 5 characters to carry the film, and have the rest just fight off cannon fodder :lol