Because he's so smart and charming and knowledgeable about the issues that matter, so she's completely enraptured by him.

Just the other day I was explaining how when you buy a 2 metre HDMI cable it tends to be only 1.8 metres long, because it's likely based on a historical measurement of "six feet", and basically all the women nearby were completely seduced and pretty much wanted to marry me on the spot.