Science fiction and sex

When a novel begins with the words, "The penis will be obsolete in five years," , one gets the idea that the interaction of sex and science fiction can be far more creative than pulp novels with scantily clad victims in the clutches of tentacled horrors. Sex need not be the only provocative element; science fiction and religion meets sex in Stranger in a Strange Land and Brave New World. Reproduction divorced from sex is a key element in Brave New World, but also Hellstrom's Hive.