Try to stand like a cowboy or a gun fighter.
A sexually aggressive posture will either cause a defensive response or a welcomed response.
hook your thumbs in your belt and point down such that your private parts are framed by your fingers, legs apart. A tight grip on the belt implies a stronger signal. Elbows held out to the sides shows a man is trying to enlarge their appearance which women may find attractive (AMOGs are comfortable taking up space and being heard, while betas try to take up little space and avoid being heard). If she IOD's (e.g. crosses her arms) then she does not accept your demonstration of sexual aggressiveness, but if she IOIs, then she does.
The female counterpart to the cowboy occurs when she places her hands on her hips with elbows out. This position draws attention toherself, emphasizing her fertility by increasing her hip-to-waist ratio, and is an ioi. A woman who does a cowboy posture may also be considered sexually assertive.