It has been my experience that women use words like kinky as a selling point, without there actually being anything behind it. This interaction is a rare example of a woman underselling exactly how weird she is. Of course, by internet standards Alex is actually fairly tame, but in Reggie’s world she’s completely foreign. Little does he know that his sister is at least as odd, but that’s as may be. Reggie at least is open to the idea that weirdness might be something he could get in to. He may be a little judgey about it, but in pursuit of someone he’s very interested in he may well be able to adapt. He doesn’t actually know himself very well. His general lack of introspection, & current forays into it, give him an opportunity to learn who he is, or who he might like to try being. In contrast Alex knows who she is & is willing to risk something to find out if who she is might be accepted by someone who might, potentially, really come to love her someday. Ultimately they both hope to be accepted for who they are, even if one of them is beginning to wonder about who they are.