Wake Forest University's Institute of Regenerative Medicine, which has successfully grown human bladders in the lab using only a few extracted cells sprayed onto a chemical frame that mimics the body's tissues, has so far been unsuccessful at regenerating penises because of the organ's complexity. However, it announced in a November journal article a success with rabbit penises. Four of the 12 rabbits with lab-grown phalluses successfully impregnated females, and in an unexpected finding, the new penises appear not to lessen sexual desire, in that all 12 of the rabbits began mating within one minute of meeting females.

Occasionally, people lose their short-term memory following vigorous sex, according to doctors interviewed for a November CNN report on "transient global amnesia." The condition occurs because blood flow to the brain is restricted by the strenuous activity, temporarily disabling the hippocampus from recording new memory. One sufferer, "Alice," recalled her experience, recounting how she initially cracked a joke about being unable to remember how good the sex was that she just had, and then supposedly repeated the joke over and over, each time as if she had just thought of it.

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