Where to put the patch

So I’m going away with my boyfriend to the beach. I want it to kind be hidden or discrete. I’m also afraid that if it got sandy, it might wear at the edges. Has it stayed out even when it got sandy?

Also I’m sure that the will be a lot of sexy time so I can’t put it where there will be grabbing,

Has anyone tried the hip area? Thinking it will be sorta covered.