JP are multithreaded, EN are not.
If JP play into anything sexual, they can carry on doing other things with distinction and not be held back by it. As long as it's done with intent, the audience can respect it. The downside is anything unintentional being found out can be a career killer.
If EN play into anything sexual, that fact is held against them throughout their entire career despite what other accomplishments they set out to do. See how many people try to tease incredible concept artists in Japan because they drew hentai once, but how nobody in Japan gives a shit. EN girls know this, so they don't risk their content being shat up by Gottemers