what is the movie name?

i saw this video way back and i know its from a movie. i think the chick kills ladies after having sex with them or something. and the scene is at the beginning of the movie too she starts by seducing a woman who is leaning(or sitting near??) on a pillar and this chick starts kissing her intensely against the said pillar and starts undressing her. the image is from another scene where she wears that bikini and has sex with that woman.