The idea is dated, especially since women, as a whole, NEVER played D&D! Nowadays, they turn to "Furries", where males and females dress up as various animals and attend conventions where they can 'zip out' various parts of their anatomies to have sex with each other while staying in character!
This is 100% pure bullshit.
For starters, playing D&D doesn't put you in the nerd ghetto like it used to. It's practically mainstream these days. Seriously, The Rock plays D&D.
Furries, on the other hand, are in the nerd ghetto of the nerd ghetto. Especially the ones who fuck in fursuits, whom even the more mainstream furries think are kind of out there. There are way, way more D&D players than furries like that.
There are way more girl D&D players than furries like that, too. Guys have always been the majority in the hobby, but there are a lot more girls in gaming than there used to be (for which I largely credit Anne Rice and Vampire: The Masquerade for bringing in a healthy infusion of hot goth girls). But even back in the day, the situation was nowhere near as bad as the stereotypes would lead you to believe.
Almost every group I've played in - and I've been gaming since the Moldvay red book back in '82 or so - has had at least one girl in it. I played in an AD&D 2E campaign in high school in the '90s where I was the token guy in an otherwise all-girl group. (Though, sadly, I was only banging one of them.) My girlfriend was the DM; the other players were mostly the various girlfriends of the guys in the game I was running at the time (which my girlfriend also played in).