Interesting bit of trivia I turned up while looking for this:
"In 1977, Kim Casali, the cartoonist who drew the syndicated ''Love Is'' cartoons, became pregnant with sperm her husband, Roberto, had frozen when he underwent treatment for cancer. After her husband's death, Kim successfully used the sperm. The birth announcement listed the parents as ''Kim and Roberto (posthumously).'' Casali herself died in 1997."
The cartoon is drawn by Bill Asprey and here is his website: