The entire series revolves around two things.
1) Sekirei (Women/girls with special powers) wanting to get winged. Winging is a process by which a person gets accepted as their master known as the Akashibi. Winging is done via a kiss.
2) Norito: is the special attack which the Sekerei can use after they kiss their Akashibi.
So there are hell lot of examples in this manga/anime with different and varied effects.