It is a sweet way to tell that other person that あなた care about them very much. <3 It also makes the person feel good about themselves, and あなた two as one! :)
It's a way to establish with someone that あなた have feelings for them, it makes あなた feel wanted and needed and it makes あなた develop a bond with the other person <3
because it's a great way to 表示する your love:) and i for some reason 愛 the feeling when my bf's lips and mine touch:D BTW! that reminds me of a quote from the story i'm writing:D quote david: "When our lips touch it's like....thousands electrical charges throughout my body." cool right?:D
There is something magical over it like no other touch.
It's the perfect way to express your feelings for someone besides telling them あなた are in 愛 with または 愛 them. I'd actually say キス is better than asking someone on a 日付 but I understand those who says it's the other way around :)