The Saki (manga) is published in a seinen magazine, so it's meant to appeal to more mature audiences. It contains plenty of fanservice and yuri, but is more moe than erotic, making it mildly ecchi.
In the Sakiverse, men exist in seemingly normal numbers, but most of the women in the story are much more interested in mahjong or each other.
Oddly, high school girls rarely if ever wear underwear. They do not wear bras and the only time they wear panties may be during cosplay or as a punishment for losing a game. Stockings go no higher than thigh-high.