The women in the Thieves' Guild seem to get a lot of male attention. Tonilia is dating Vekel (and depending on who you believe, having an affair with Brynjolf). Both Delvin and Beefy McFarkasVoice Garthar have a thing for Vex. Vipir is constantly hitting on Sapphire, and I can't imagine he's the only one interested in her.

And F!DB gets...nothing. I want to see a fic where she thinks this is because she's undesirable...maybe she has a prominent facial scar that she's been teased about in the past, or maybe she's a mer and doesn't think they find her attractive because of her race. In actuality, however, several of the members have a thing for her and it's just that in their minds she jumped straight from "Don't scare away the newbie" off-limits to "Out of my league/intimidating" off-limits with no flirtable period in between.

Potential scenario: Someone works up the courage to hit on her (preferably really badly), and she's either super-flustered and doesn't know how/whether to turn him down, or is totally ready to go for it--then several of the other members are like "HEY WAIT, you're not immediately shooting him down! What about me?" and she is completely confused and overwhelmed but gets over it enough to end up in bed with her pick(s) of the lot.