19f acting weird around me 29m

Idk what to do guys/females my mate slutty miso keeps coming walking around with no panties on , leaving them around the house like is this normal? I’m not complaining I like what I see n we all live together ect what not but lately I’ve noticed her dressing more slutty when it’s just her n I alone?? I’ve done the old sly trick yk wait for her bend over and have a look , kinda feel grossed out yet she’s (19F) and I’m (23m), she’s got a nice set of boobs blonde hair and tight little ass just enough to grab .. I’ve waited for her to come outta the shower due she leaves her panties all over the ground and I couldn’t resist… she’s does weird shit like take my phone when he’s not around n take pics of her self , walk around the house in g-string n bra , caught her few times without panties on didn’t think much of that situation, still remember she flashed me idk on accident or anything but her mans passed out next min I walk around the corner , bam pair of tits in my face .. is it normal???