People need to stop using things the read in things like anime or 4chan as if it's the case. For example, japan literally has one of the higher birth rates in east asia[0], above china and taiwan, but no one talks about the "sexless chinese society" because the media narrative for decades has been that china is overpopulated.

Just a note, Japan's birth rate is 1.34, while Germany's is...1.53. A whopping 0.2 humans more. In fact, it was in line with Japan's until 2010 (and the influx of migrants I assume), and no one is talking about the sexless German society, because people are slow to let go of stereotypes and tropes they have about nations, many of them completely separate from data.

[0] https://twitter.com/Birdyword/status/1615241561159380995