probably she was thinking that: 1) you are a gay; 2) you could be a "friend" just for sex-discussing to mutually impove sex theories; 3) you are not attractive to her at all and she won't have any wories about further sex-relationship with you; 4) She is not attractive to any male at all and considering you are the one of the potentials that she can practise sex with; 5) teasing and playing with you; 6) she has very strong sex desire inside and are waiting for ... 7) she has some intrest with you (but i really doubt it); 7) she just wants to "dig a hole" for you and you put the hole here...