An animal defending against a predator may engage in either " fight or flight " in response to predator attack or threat of attack, depending on its estimate of the predator's strength relative to its own. Alternative defenses include a range of antipredator adaptations , including alarm signals . An example of an alarm signal is nerol, a chemical which is found in the mandibular glands of Trigona fulviventris individuals.  Release of nerol by T. fulviventris individuals in the nest has been shown to decrease the number of individuals leaving the nest by fifty percent, as well as increasing aggressive behaviors like biting.  Alarm signals like nerol can also act as attraction signals; in T. fulviventris, individuals that have been captured by a predator may release nerol to attract nestmates, who will proceed to attack or bite the predator. 
Another interesting fact to consider is the time it takes each sex to achieve orgasm through penetrative sex. Men often climax in roughly seven to 12 minutes; women, on the other hand, may need up to 20 minutes. It only makes sense that men should focus less on the effects of testosterone and penis size and more on the effects of the hormone on their stamina. Just as testosterone can allow men to work out more intensely for longer periods, the same can be said for sex. This is yet another reason why men and women alike report having better sex lives when men use testosterone supplements.