Are you just spouting or do you know for a fact that she was not a virgin?
I am only repeating what I have already read on here. The hypothesis of sexual activity is by far the most likely (occams razor, remember) to explain these phenomena, and the type of home she lived in would almost make it inevitable...
Whose ARE all these prints all over the house including Danielle's room? Adult women, adult men, all unidentified.