http://bjp.rcpsych.org/content/177/6/484.full
"The excess rate of DSH in females, plus the stronger association between DSH and suicide in males (Hawton & Fagg, 1988; Hawton et al, 1998), suggest that acts of DSH by females are more often based on non-suicidal motivation. In females, the appeal function of DSH, whereby DSH is used to communicate distress or to modify the behaviour and reactions of other people, seems more common. In males, DSH is more often associated with greater suicidal intent. It is interesting that in community samples, suicidal ideation is reported far more often by females than males (e.g. Paykel et al, 1974).
It is well recognised that males tend to use violent means of both suicide and DSH more often than do females. Greater suicidal intent, aggression, knowledge regarding violent means and less concern about bodily disfigurement, are all likely explanations for the excess of violent suicide in males."
Bottom line: There is no "middle ground" for men (hurting yourself to call for attention is not an option), so they tend to just go straight for suicide (as they are more "hopeless" in trying to find help, while women tend to first hurt themselves and then hopefully get helped. Given male suicide rate IS higher,
it seems like oftentimes women DO get helped.