Because most people pick names that are vague. Like musicus. Is that a masculine name? A feminine one?
Or maybe it's because here on Literotica we subscribe to the notion that being an HNG* and crying the AOL chat greeting of "A/S/L?" "A/S/L?" is only going to make you look like a noob.
Conversation is where it's at on Literotica. That's Lit... as in Literary. Well read, versed in the use of the written word.
Good Luck!
*HNG - Horney Net Geek - a person seeking sexual activity without much regard about who responds. See also "Troll".