On here, Zettai Karen Children.
Fujiko Tsubomi is really hot and has kissy powers and a cute personality, I wanted to see if there was more of that.
So I just started with the series from the beginning, even if she wasn't featured early on. I was curious about what the series was about, and I really ended up enjoying it, eventually even forgetting that what got me into it in the first place was me being pervy. lol
Also, not from here, but I got into Densetsu no Stafy for similar reasons.
Though it wasn't the only reason, it was a major factor. I just found out about the series at random, I saw gameplay of it and thought it was cute looking and seemed fun. But I also saw a bunch of the commercials (probably all of them that could be seen at the time), and I liked all of them, they were early 2000s colorful short animations, but one in particular caught my attention even more, it just mesmerized me, it had a intense kiss scene between the main character and what I assumed at the moment to be an enemy from the game, it felt really weirdly "sexy" for the rather younger me back then. So I wondered if that happened in-game, since I thought it was a kissy enemy on the commercial, like many others I have seen in games before.
Of course, when I played it, I didn't find said enemy. And doing better research of the game, I learned that it wasn't an enemy on the commercial, just a friendly NPC, who sadly, despite showing up a lot in all the games, except one, doesn't give off any kisses in-game. She's very enthusiastic about kissing and aggressively flirty, but that only shows up on dialogue and box-arts.
She does kiss some characters on the manga, on some parts, but that manga is really hard to find, and sadly it still doesn't live up to the commercial scene... makes you wonder if whoever came up with that scene had a fetish like ours.
These are the only ones I can think of, otherwise, it's generally stuff I already like that I end up finding something hot about. And in some cases, I get into a character a little more because of such a thing (for example, one of my favorite Pokemon is Jynx, and it happened slowly exactly because of her kissing attacks).