Historical clue formulations

• Lovey-dovey, in a way — 2024-03-23
• ___-face — 2019-04-14
• Given to smooching — 2017-03-07
• When doubled, very affectionate — 2015-06-13
• When doubled, displaying affection, informally — 2011-11-22
• ___-face — 2007-05-12
• Affectionate, slangily — 2004-07-18
• Affectionate, in slang — 1997-06-13