Ive heard these alot, when i first started PUA, and the above is correct with the right attitude and build up, you avoid them all together, but dealing with them i used to fire back cheeky remarks such as...
"you sure cause from over there you like kinda desperate" - said with a cheeky grin normally gets the responce of
" :O SHUT UP " (playful slap on arm )
then you move on....
anther one, i used ill admit i heard somewhere else and if i could remember where i would give credit to them...but reply with...
"me neither nothing complicated...just plain and simple (pause) sex " - sometimes you get a serious ok (with confident women normally) and you get lucky

other times you get a laugh which you should still act like your serious and move on to the classic " im serious im far to high maintance for you to handle you would hate dating me" etc...
hope this helps mate