I've noticed that I repeat a few lines with every girl, i.e my usual "wow, I would let you steal my shirts to use as pajamas" "but I should be careful, or you would leave me without any shirts", since I love the double entendres, and I use them a lot, it works pretty well, and because of that, I always use it when I've just started talking to a new girl. So you use the same line with all the new girls, or you treat everyone like a new conversation and avoid to repeat? Sometimes I think that I shouldn't use the same, but since it works very well, I end up using it anyway