“I don't trust any man who hasn't kissed another man.”

Found anonymously in newspaper columns from the early 1920s http://quoteinvestigator.com/2015/12/31/kiss. Originally presented in dialogue format https://www.newspapers.com/clip/5219841/safety_first/: "Dorcas—”Do you ever allow a man to kiss you when you’re out motoring with him? Philippa—"Never, if a man can drive safely while kissing me he’s not giving the kiss the attention it deserves."
It does not seem to have been attributed to Einstein until the 1990s (e.g. here https://groups.google.com/forum/message/raw?msg=alt.freemasonry/YILn0A-U_WM/f1Grm2akU-4J).
Misattributed

И если умирает человек,
с ним умирает первый его снег,
и первый поцелуй, и первый бой...
"People" (1961), line 12; Robin Milner-Gulland and Peter Levi (trans.) Selected Poems (London: Penguin, 2008) p. 85.

Source: Shantaram

Source: Works and Days (c. 700 BC), line 375.

II.3.7
The First Ennead (c. 250)

Source: Shadow of the Almighty: The Life and Testament of Jim Elliot

Lews Therin Telamon
(9 November 2000)
Source: Winter's Heart

Larry King Live interview (2010)
Context: I don't hate America. I love America. I want it to be better. The only way we can get it to be better is to realistically criticize what's wrong with it. That's not what the Republicans do. … I don't want to be a pessimist. I'm a realist. One man's realist is another man's pessimist. But, no, I'm not like Mitt Romney, whose book is called No Apology, the Case for American Greatness. Really? Always waving the big foam number one finger; we're not number one in most things. We're number one in military. We're number one in money. We're number one in fat toddlers, meth labs, and people we send to prison. We're not number one in literacy, money spent on education. We're not even number one in social mobility. Social mobility means basically the American dream, the ability of one generation to do better than the next. We're tenth. That's like Sweden coming tenth in Swedish meatballs.