I'd let them know, regardless of if they're a guy or a girl (I'm a guy). I have only seen two malfunctions, one being my own fault: A new rider in the group ride wearing her gloves the wrong way (the gel padding was on top of her hands, instead of below her hands where they should be, in between her hands and the handlebars), and the second being myself, wearing my arm warmers the wrong way (the thinner panel over my bicep instead of tricep, was wondering why I got so cold!)