Animeanime.jp did a poll about the most popular kisses in anime history (May 23 is Kiss Day in Japan) this is the top 10:
1st "Detective Conan" Shinichi Kudo and Ran Mori
2nd "Sword Art Online" Kirito and Asuna
3rd "Assassination Classroom" Nagisa Shiota and Kaede Kayano
4th "Pocket Monsters" Satoshi and Serena
5th "Fruit Basket" Tohru Honda and Kyo Soma
6th "Sasaki and Miyano" Hidenari Sasaki and Yumi Miyano
7th "Inuyasha" Inuyasha and Kikyo
8th "Re: Life in a different world starting from zero" Natsuki Subaru and Emilia
8th"Movie Yes! PreCure 5 GoGo! Happy Birthday in Candy Country ”Coco and Cure Dream
8th "The Melancholy of Haruhi Suzumiya" Kyon and Haruhi Suzumiya
Source:
https://animeanime.jp/article/2022/05/23/69667.html