Sadly true. 100% confirmed, since I have three MMORPG-playing friends (names withheld to protect the guilty) who frequently play female characters. Their excuse is "if i have to watch a person's rear running around, it should be that of a girl".
Well, my Kinship on Lord Of The Rings Online had (and still has) many actual female players playing female characters. There were also many male players who played male or female characters as they wanted. But then LOTRO had rather balanced players. On WoW or FInal Fantasy, the players can be different in their outlook.