When you say personal responsibility you are ascribing moral value to sex.
No... Identifying that a consequence to an action, like sex potentially leading to pregnancy.
You can now ascribe your version of the level of responsibility that the contributors (male/female) made in terms of their moral code
Unfortunately there is none, and historically the link between sex and morality is meant to control female sexuality, that grand mystery you all want to possess and so jealously oppress.
You gotta be kidding.... Playing the victim card and reaching wwaayyy back to the perceived societal norms from the 40's or 50's.