From when harry met sally...sums it up:

Harry Burns: You realize of course that we could never be friends.

Sally Albright: Why not?

Harry Burns: What I'm saying is - and this is not a come-on in any way, shape or form - is that men and women can't be friends because the sex part always gets in the way.

Sally Albright: That's not true. I have a number of men friends and there is no sex involved.

Harry Burns: No you don't.

Sally Albright: Yes I do.

Harry Burns: No you don't.

Sally Albright: Yes I do.

Harry Burns: You only think you do.

Sally Albright: You say I'm having sex with these men without my knowledge?

Harry Burns: No, what I'm saying is they all WANT to have sex with you.

Sally Albright: They do not!

Harry Burns: Do too.

Sally Albright: They do not.

Harry Burns: Do too.

Sally Albright: How do you know?

Harry Burns: Because no man can be friends with a woman that he finds attractive. He always wants to have sex with her.

Sally Albright: So, you're saying that a man can be friends with a woman he finds unattractive?

Harry Burns: No. You pretty much want to nail 'em too.

Sally Albright: What if THEY don't want to have sex with YOU?

Harry Burns: Doesn't matter because the sex thing is already out there so the friendship is ultimately doomed and that is the end of the story.

Sally Albright: Well, I guess we're not going to be friends then.

Harry Burns: I guess not.

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Love...the slowest form of suicide.