I guess it will appeal more to those familiar with Superman; my own exposure is limited to very occasional pictures in Indian media with a costume that has S marked on front.
Story tells us Superman is one of a race of aliens called "kryptonians", & goes on to satirically discuss his sex problems. There are references to "Clark Kent" & "Lana Lang" - presumably Hollywood actors (I'm not sure).
It's not for those offended by explicit sex talk.
Fact sheet.First published: Knight, December 1969.
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Related: All stories of Larry Niven.