My observation is females drink their teas light while males drink them strong.
Other than the fact that men want to be perceived as macho men, less of a wimp, it has a lot to do with life style.
Strong tea can clear excessive body heat, detox, nourish lung, clears mucus, induce urination, help digestion of fatty food. These are not the only health benefits of tea, but the part that many males need to counteract the effect on their bodies due to living habits. Males tend to drink more alcohol, smoke more, eat more meat than females. Strong tea can sober up a drunk fast, caffeine also signals kidneys to eliminate urine and toxin.
However, the old saying is moderation and moderation in everything you do. Light tea is more beneficial than strong tea in terms of health prevention, and prolong life. Light amount/strength can do only good to your body with little to none of the bad. Over drinking tea, especially strong tea can cause yellow skin complexion. No it's not because I am Asian! :P