She has to laugh at that. She's not even embarrassed that Betty uses the word 'virgin' (well okay, maybe a little bit embarrassed), it's just too amusing the way she puts it.

"I assure you your girlfriend's lips may have been virgin until just now," not anymore, mind, "but I'm not all that innocent. And do you really have a place of your own still? I can't even remember the last time you were there." She drops the teasing tone, smiling at Betty. "It's fine. Having you over is one of the things I'll be happiest about, now that we're dating."

Before it was always a source of endless frustration. Sure, she liked Betty's company and friendship for what it was, but still.