Kiss card

In a book I’m reading, a character mentions buying a “kiss card”. The year is 1950. I’m thinking that it’s something like a dance card where guys could reserve dances with a girl in advance at social events, but that doesn’t seem quite right. Can any of you older 'dopers tell me what exactly a “kiss card” is? When I google it, all I get are trading cards for the rock band KISS. I know that isn’t it.

There used to be “buy a kiss” type things at fairs and social events.