
Reply to a young actress who asserted that an older actor in a production showed too much affection for the leading man (c. 1910); as reported by Alan Dent in Mrs. Patrick Campbell, p. 78 (1961).
[horses]Variants: "My dear, I don't care what they do, so long as they don't do it in the street and frighten the horses."
"I don’t mind where people make love, so long as they don't do it in the street and frighten the horses."
"It doesn't make any difference what you do in the bedroom as long as you don't do it in the street and frighten the horses."
"Does it really matter what these affectionate people do, so long as they don't do it on the street and frighten the horses?"
On the internet, a similar comment regarding politicians has been widely attributed to Victor Hugo, but without any definite sources. It appears to be a modern satirical invention, derived from Mrs. Campbell's statements.