Sex improves your sense of smell. It is known that levels of the hormone prolactin surge after orgasm, and frequent sex boosts the overall levels of this hormone. Now a study of mice shows that elevated prolactin causes the number of neurons in the brain’s olfactory bulb to proliferate, presumably heightening the sense of smell. Researchers suggest that the evolutionary significance of this finding is that increased “scents-itivity” adds to recognition of mates and offspring, cementing family bonds. Telegraph UK