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Humans sleep at night and work during dayhours.Most of the sexual play involves some light. But the crucial difference is in the wiring of perception and rest of physical body.Although light may produces some degree of happiness,it is the brain which coordinates the all the senses. Example candle light romance. Or extravangant use of light at entertainment parks or events. During sexual play the beauty of female or male body produces gives greater pleasure.=====Some insects emit light naturally. This light is specially used to excite male or female member.================However I am not sure how much we can generalize this behaviour. The field work is missing.
Notice how spiders tend to build their webs around the lights to catch more bugs. Pretty smart.