What the heck is this? Are they the asari of TES now? Lame.
The main source of this is (AFAIK) The Real Barenziah. Thing is, even there, it is said in a way that sounds like they are claimed to be promiscious rather than stating that they really are.
Unfortunately, people can't read, and suddenly a rumor is a fact.

(I get the same kind of vibes from this like irl, if a guy is with many girls, he's cool, but if a girl is with many guys, she's a [the word I want to use will be censored].)