Cannot stand my dad's girlfriend?! I want her out NOW!?

I'm 16 and she's 21, she is the biggest whor.e ever! she comes over everyday and all i hear is mmmm babyy OOOHH OOOOOOOOOOOOH OOOOOOOOOOOOOOH. my dad's 42 and it's just like come on have some respect!!!!! she has to leave NOW how do i do it?