The demand for sex from men is near-infinitely high. It always has been and always will be. The only limiting factor in how much sex we are having is how much women wish to give it out.

If people are living at home, men don't care about that, we'll work our way around and have sex in the 30 minutes the parents are out.

If people are having less emotional connections because of dating apps, men don't care about that. We don't need an emotional connection.

Women are the ones who distribute sex and so if the supply of sex has fallen, we need to ask why are women giving out less sex.

I will postulate this explanation:

Women are less attracted to most men than they ever have been.

The reason for this is fairly obvious: Women's increased status coupled with their innate hypergamy means they have a smaller dating pool than ever before. In addition, every woman being able to interact with men way above her league on dating apps has raised her to standards to an absurdly high level.

People living at home is probably an issue, but not because of the inconvenience of having parents. It's because if a guy lives with his parents he's already innately less attractive to women in the first place.

Women have absolutely no desire to sleep with an "ok" guy any more, why would they? This is why the sex is falling.