Characters
No man can be friends with a woman he finds attractive. He always wants to have sex with her.
— Harry • When Harry Met Sally...

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker asserts a blunt rule: a man who finds a woman attractive cannot be simply her friend, because he will always want sex with her. Presented as a sweeping generalisation, it treats desire as inevitably undermining friendship, which is the speaker's opinion rather than an established fact.
Context reviewed