Man of Steel, Woman of Kleenex
"Man of Steel, Woman of Kleenex" is a 1971 essay in which science fiction author Larry Niven details the problems that Superman would face in sexual intercourse and reproducing with "a human woman designated LL for convenience," using arguments based on humorous reconciliation between physics, biology, and the abilities of Kryptonians as presented in Superman comic books.
Lois & Clark: The New Adventures of Superman normally averted the point, even during the titular characters' marriage. The exception was one case when Superman lost fine control over his powers due to red kryptonite exposure. In that episode, Clark accidentally gave Lois a bruise when hugging her, and did not dare to sleep in the same bedroom until the problem passed.
The television series Smallville also cited the same argument to explain why Clark refused to sleep with Lana Lang when he was in possession of his super powers. They were, however, able to be intimate when she also had super-powers in season eight. In the season nine episode "Escape", Clark tells Chloe that he has been learning how to control his powers so that he would not harm a human during intimacy.
In the 2008 movie Hancock, the "dangerous ejaculation" scenario is illustrated in a deleted scene when, at the point of climax, he throws his partner aside to save her, blowing three large holes in the roof of his trailer.
The 2012 graphic novel Superman: Earth One, Volume Two has Jonathan Kent trying to warn an awkward teenage Clark about sex, saying "Man of Steel, Woman of Kleenex. That's all I'm saying."
- Niven, Larry. All the Myriad Ways (Ballantine Books, 1971).
- Niven, Larry. N-Space (Tor Books, 1990).
- Penthouse Comix #5 (Jan./Feb. 1995).
- Penthouse Comix' "Man of Steel, Woman of Kleenex" reprinted in full (with Swan illustrations)
- Original 1986 Usenet discussion of copyright violation