Taking your last statement first; perhaps SHE should get to know the man better before SHE allows him to have sex with her?
Lizzie is right, and your own comments support this...a woman lives in her own body and (unless raped) is absolutely sovereign over it.
That means SHE has the primary duty of care for it.
A man does not consider his sperm as having any special significance. You'd be surprised how much we intentionally waste in any given month even without women involved.
No one is arguing "fault."
We are arguing responsibility. When a woman gets pregnant, if she TRULY believes both share responsibility then she would automatically take that into account before unilaterally deciding to have a child. If she does not wish the responsibility of having a child, no one (pro-choice) argues with her right of opting to abort. So, if HE does not wish the responsibility of raising a child why does she still get to decide for both?
You keep arguing that his unwillingness to "accept responsibility" without any free choice in the matter somehow makes the man unworthy; as if he really has ANY say in your unilateral decision. Clearly he does not. Equally clearly you would prefer to force lifelong obligations to a child and lifelong connections to you onto him wholly against his will.
Just how does that typically work out in the real world for all concerned? Not very well from all reports.
If you are pro-life then the greater responsibility is still on the woman. She has moral objections to abortion, so she has the absolute responsibility to ensure all steps are taken to prevent an unwanted pregnancy. She cannot blame the man because nothing can happen without her willing agreement; NOTHING. So I repeat, she should make sure it's a man SHE`can trust before taking that step. Hmmm?