Love / Starosta & Staroscina - Polish wedding tradition [10]

Hey there people, basically i have a girlfriend that is polish (we both live in London)and we have been together for almost one year, however, recently she has informed me that she was involved in a wedding tradition called Starosta & Staroscina when she recently returned to Poland to attend a wedding and was chosen by the bride, she tells me that she as part of a custom had to kiss the male counterpart on the lips for quite some time, is this true? now if this is true i don't mind, and i will respect the tradition, i would really appreciate some educated and experienced answers, thank you.