He means if someone is raped and falls pregnant, they must have consented, therefore it wasn't 'legitimate rape'. Don't ask what scientific or rational base he works on, because there isn't any. Standard GOP dogma.
He's a very dangerous man and so are people who vote for him.
One of the Urban Dictionary website new entry:
Legitimate Rape437 up, 252 down
August 20, 2012 Urban Word of the Day
Rape between one man and one woman who are not married or even acquainted; the only rape sanctioned by the Republican Party.
"Was it legitimate rape, or was it just like, hilarious prison rape or acceptable acquaintance rape?"
linkLOL