Sentence:  In the dusky streets around me ruled an innocent and open <WSD>copulation</WSD>. The entire town mated together, in the leafy bowers that had sprung up among the washing-machines and television sets in the shopping mall, on the settees and divans by the furniture store, in the tropical paradises of the suburban gardens. 
Meaning of the word marked with <WSD> tags:  Sexual procreation between a man and a woman or transfer of the sperm from male to female; usually applied to the mating process in nonhuman animals; coitus; coition.