“Programming is like sex: One mistake and you have to support it for the rest of your life” is a jocular programming saying that has been printed on many images. Michael Sinz (Amiga Software Engineer) posted on the saying on the newsgroup comp.sys.amiga.programmer on June 4, 1991.
       
   
Google Groups: comp.sys.amiga.programmer
68040 Compatibility Warning
Michael Sinz
6/4/91
(...)
/———————————————————————————————————\
|    /// Michael Sinz -  Amiga Software Engineer             |
|    ///            Operating System Development Group       |
|  ///  BIX:  msinz     UUNET:  rutgers!cbmvax!mks           |
|\\\///  Programming is like sex:                        |
| \XX/    One mistake and you have to support it for life.        |
\———————————————————————————————————/
 
Google Groups: comp.sys.amiga.programmer
Source to OS (Was Re: Information on Amiga Technical Reference Seri)
Michael Sinz
6/11/91
(...)
/———————————————————————————————————\
|    /// Michael Sinz -  Amiga Software Engineer             |
|    ///            Operating System Development Group       |
|  ///  BIX:  msinz     UUNET:  rutgers!cbmvax!mks           |
|\\\///  Programming is like sex:                        |
| \XX/    One mistake and you have to support it for life.   
 
Google Books
Dictionary of Proverbs
By G.kleiser
New Delhi, India: A.P.H. Publishing Corporation
2005
Pg. 156:
Programming is like sex; one mistake and you have to support it for the rest of your life. — Michael Sinz
 
Google Groups: STIKOM Linux User Group
“Programming is like sex: one mistake and you have to support it for the rest of your life.”
IMade Sriardana
9/28/05
“Programming is like sex: one mistake and you have to support it for the rest of your life.”
 
Twitter
Tim Stewart‏
@Jimtac
Programming is like sex, one mistake and you have to support it for the rest of your life. - Michael Sinz
5:19 AM - 4 Apr 2007
 
Reddit—LearnProgramming
“Programming is like sex. One mistake and you have to support it for the rest of your life.” by [Michael Sinz] . Any other interesting quote that you know ? (self.learnprogramming)
submitted January 14, 2014 by ankur89
 
Google Books
C++ for Financial Mathematics
By John Armstrong
Boca Raton, FL: CRC Press
2017
Pg. 79:
Old Joke: Programming is like sex. One mistake and you have to support it for the rest of your life.
   
Twitter
MageTitansUSA‏
@MageTitansUS
Programming is like sex: One mistake and you have to support it for the rest of your life. #NationalTellAJokeDay #joke
2:02 PM - 17 Aug 2017