Two reasons.
1. An increase in female viewers, one of my favorite series Jojo had to change their male character designs in part 4 and onwards to look bishounen and less rough. They did this so they could appeal to a female audience, instead of keeping the manly characters that were full of muscle and signified strength aswell as depth. Notice how that degenerated from character designs to your average anime male character in today's shows being a shy awkward kid that is constantly finding reasons to be emotional, dramatic and depressed. That's because most male kids these days relate to that disempowered character but not all series have become like this, thankfully we still have great series like Toriko where you could enjoy all the things you did in the 90's.
2. The scarcity of real *** which creates a need that must be fulfilled through other outlets, notice how the most sexually repressed countries have the weirdest porn like Japan and Germany. When you have a society where there is scarcity of real *** people are going to find ways to relieve themselves, this results in an over-sexualized society where people fool themselves into thinking there is too much *** but don't realize their hunger is what created this in the first place. There is a reason Japan has the lowest birthrates, when you have young teenagers who are watching hentai, ecchi and the other weird shit. The corporations doesn't care, it's more money to them so they will continue to pump out more sexualized anime, *** robots and whatever other stuff they think about for consumers to indulge in, they're getting rewarded for self-destructive behavior and this leads to a generation of misguided kids that produce a whole other problem.
