There are much more areas that are considered erogenous zones on the human body than the "crotch and butt". Lips are considered one of them, as described by others above. The neck, ears, nipples, toes...well, it can vary from person to person but most people have other areas of their body that if sensually stimulated can produce sexual arousal. Obviously for the male, this would mean erection which is biologically important for procreation. For the woman, this would mean lubrication, among other things. It is shown that while not necessary, a woman's sexual pleasure increases the chances of getting pregnant. So, from a strictly clinical standpoint kissing and other non-genital contact does have its role in human reproduction. But, if you're kissing strictly for clinical reasons, you need a new partner.
Is it normal I do not understand the purpose of kissing?
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There are much more areas that are considered erogenous zones on the human body than the "crotch and butt". Lips are considered one of them, as described by others above. The neck, ears, nipples, toes...well, it can vary from person to person but most people have other areas of their body that if sensually stimulated can produce sexual arousal. Obviously for the male, this would mean erection which is biologically important for procreation. For the woman, this would mean lubrication, among other things. It is shown that while not necessary, a woman's sexual pleasure increases the chances of getting pregnant. So, from a strictly clinical standpoint kissing and other non-genital contact does have its role in human reproduction. But, if you're kissing strictly for clinical reasons, you need a new partner.