Religion may play part, but one of main reasons is economic independence. If a couple of decades ago people had to cooperate to just survive, at least where I l

Religion may play part, but one of main reasons is economic independence. If a couple of decades ago people had to cooperate to just survive, at least where I live, now many are financially independent and can survive perfectly without outside assistance. This reduces the need for social interaction and even seeking partner. Another big reason I'd say is vast availability of solitary entertainment through TV and Internet that further reduced need for interaction.