She probably saw some hot guys and creamed in her panties...Either that or she went to a chippandales show and got all wet staring at the guys in thongs shakin their dongs...More than likely it's one of the two...
My girlfriend came home with really wet knickers after a night out. What has she been up too?
You need to really check her phone and social media accounts to know what she's been up to lately. I once had a similar issue but I came in contact with a professional who helped me out, his name is Smith. You can contact him on his gmail account( Williamsdhackghost at gmail..com) I'm sure he'd help
Well if you don't know maybe she pee'd herself laughing at her gormless boyfriend at home,
I quess she had pis**d herself after too much booze unless she,d been swimming like Ray says.