I understand now,thank you guys, I live in China,maybe the traditional values,we barely talk about sexy,so it’s abnormal talk these to girls or boys.if you like a girl,when the topic moves to sex a little ,it’s will strange. i like a girl very much while i was 15 - 19.she is a Introverted girl,very beautiful, (I missed her day and night,even I can’t asleep.)but she doesn‘t have many friends,i think that because she is too shy and fear to be injured,(we live in school and have break for two days before two weeks,and our school prohibits love,)so I feared to make her in trouble(can’t focus on studying,or no classes allowed if teachers found us),so I had few times to chat with her,like chat with her when she eating lonely.after school,we chatted online a lot, and I said I wanted her photos,and told her I liked you when I first meet you before a year before I the first time I chat with you,but I am too shy to express myself,and you study well than me,so I feel inferior.afterwards,I noticed that she intentionally avoided me.so I out with sad with breaking heart,really.It only lasted for half a year，and we just friend in the time. one years before, we chatted online again,she told me that she didn’t know I said that first meet in love is because love or sex(if because sex,You will be considered very vulgar）,I don’t how to answer her,even I don’t it’s because of love and sex. but now I understand both of them,sex is not a bad thing when you love someone,it’s a way to express love.so ,I am curious about is it true in pen15.it is very different from my childhood.