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kiss and tell
1. To tell others about a sexual encounter, usually in order to brag about it. Most girls avoid Johnny because they know he loves to kiss and tell so all his buddies think he's a player.
2. By extension, to tell others about something that was supposed to remain private between the teller and another party, usually in order to gossip or brag about it. To be honest, I try not to include Jane in these meetings because she has a tendency to kiss and tell when she's privy to sensitive details.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
COMMON Kiss-and-tell is used to describe situations where someone has a romantic relationship with a famous person and then tells people, usually journalists, about it. On many occasions we discussed selling details of kiss-and-tell stories. It looks unlikely that there will be a kiss and tell book. Note: If someone tells their story in this way, you can say that they kiss and tell. You can also refer to their behaviour as kissing and telling. In no circumstances will I kiss and tell. Aren't the footballer's girlfriends just after the money they get for kissing and telling? Note: This expression appears in the play `Love for Love' by William Congreve (1695): `Oh, fie, Miss, you must not kiss and tell'.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012